# List accounts

Returns the Axiym accounts accessible to your integration. Each holds a balance in one currency and is connected to a payment rail.

Filter by currency or account status. Account funding is arranged outside the Payment API.

Product: Payment API
API reference version: 0.1.0 (current)
OpenAPI contract: https://docs.axiym.io/openapi/payment-api/0.1.0.yaml
Canonical page: https://docs.axiym.io/payment-api/api-reference/0.1.0/accounts/listAccounts

[Compact reference](/payment-api/api-reference/0.1.0/accounts/listAccounts.md)

## GET /accounts

## Servers

```json
[
  {
    "url": "https://partner-api.sandbox.axiym.io/api/v1",
    "description": "Sandbox"
  },
  {
    "url": "https://partner-api.axiym.io/api/v1",
    "description": "Production"
  }
]
```

## Authentication

```json
{
  "security": [
    {
      "Default": []
    }
  ],
  "securitySchemes": {
    "Default": {
      "type": "http",
      "scheme": "bearer",
      "bearerFormat": "JWT"
    }
  }
}
```

## Parameters

### header: X-Request-Id

```json
{
  "name": "X-Request-Id",
  "in": "header",
  "required": false,
  "description": "Optional request identifier for tracing and support. A UUID is recommended. Axiym echoes it in `X-Request-Id`, or generates one when omitted.",
  "schema": {
    "type": "string",
    "format": "uuid",
    "examples": [
      "3fa85f64-5717-4562-b3fc-2c963f66afa6"
    ]
  }
}
```

### query: first

```json
{
  "name": "first",
  "in": "query",
  "description": "Maximum number of items to return (page size).",
  "schema": {
    "type": "integer",
    "minimum": 1,
    "maximum": 100,
    "default": 20,
    "examples": [
      20
    ]
  }
}
```

### query: after

```json
{
  "name": "after",
  "in": "query",
  "description": "Cursor for the next page, from the previous response's pageInfo.endCursor.",
  "schema": {
    "type": "string",
    "examples": [
      "eyJvZmZzZXQiOjI1fQ=="
    ]
  }
}
```

### query: currency

```json
{
  "name": "currency",
  "in": "query",
  "description": "Filter by currency.",
  "schema": {
    "$ref": "#/components/schemas/Currency",
    "examples": [
      "USD"
    ]
  }
}
```

### query: status

```json
{
  "name": "status",
  "in": "query",
  "description": "Filter by status.",
  "schema": {
    "$ref": "#/components/schemas/AccountStatus",
    "examples": [
      "ACTIVE"
    ]
  }
}
```

## Responses

### 200

```json
{
  "description": "Accounts.",
  "content": {
    "application/json": {
      "schema": {
        "type": "object",
        "required": [
          "nodes",
          "pageInfo"
        ],
        "properties": {
          "nodes": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/Account"
            }
          },
          "pageInfo": {
            "$ref": "#/components/schemas/PageInfo"
          }
        }
      },
      "examples": {
        "Accounts": {
          "summary": "Bank and wallet accounts",
          "value": {
            "nodes": [
              {
                "accountId": "5c0a9d3e-1f2b-4a6c-8e7d-9b3f5a1c2d4e",
                "currency": "USD",
                "paymentRails": "ZENUS_BANK",
                "balance": "48250.00",
                "status": "ACTIVE"
              },
              {
                "accountId": "8f1d4a2c-3b5e-4c7a-9d1f-2a6b8c0e4d3a",
                "currency": "USDT",
                "paymentRails": "TRON",
                "balance": "12500.00",
                "status": "ACTIVE"
              }
            ],
            "pageInfo": {
              "hasNextPage": false
            }
          }
        }
      }
    }
  }
}
```

### 400

```json
{
  "description": "Malformed or invalid request.",
  "content": {
    "application/json": {
      "schema": {
        "type": "object",
        "properties": {
          "code": {
            "type": "integer",
            "description": "HTTP status code, duplicated in the body."
          },
          "message": {
            "type": "string",
            "description": "Human-readable message describing the error."
          },
          "errors": {
            "type": [
              "object",
              "null"
            ],
            "properties": {
              "message": {
                "type": "string"
              }
            },
            "description": "Additional error details; null when there are none."
          }
        },
        "required": [
          "code",
          "message",
          "errors"
        ]
      },
      "examples": {
        "Malformed JSON body": {
          "summary": "Malformed JSON body",
          "value": {
            "code": 400,
            "message": "Bad Request",
            "errors": {
              "message": "Failed to parse the request body as JSON: expected value at line 1 column 5"
            }
          }
        },
        "Generic": {
          "summary": "Generic",
          "value": {
            "code": 400,
            "message": "Invalid cursor",
            "errors": null
          }
        }
      }
    }
  },
  "headers": {
    "X-Request-Id": {
      "description": "Request identifier for tracing and support, echoed from the request or generated by Axiym.",
      "schema": {
        "type": "string",
        "format": "uuid",
        "examples": [
          "3fa85f64-5717-4562-b3fc-2c963f66afa6"
        ]
      }
    }
  }
}
```

### 401

```json
{
  "description": "Missing, expired, or invalid credentials.",
  "content": {
    "application/json": {
      "schema": {
        "type": "object",
        "properties": {
          "code": {
            "type": "integer",
            "description": "HTTP status code, duplicated in the body."
          },
          "message": {
            "type": "string",
            "description": "Human-readable message describing the error."
          },
          "errors": {
            "type": [
              "object",
              "null"
            ],
            "description": "Additional error details; null when there are none."
          }
        },
        "required": [
          "code",
          "message",
          "errors"
        ]
      },
      "examples": {
        "Example 1": {
          "summary": "Example 1",
          "value": {
            "code": 401,
            "message": "Unauthorized",
            "errors": null
          }
        }
      }
    }
  },
  "headers": {
    "X-Request-Id": {
      "description": "Request identifier for tracing and support, echoed from the request or generated by Axiym.",
      "schema": {
        "type": "string",
        "format": "uuid",
        "examples": [
          "3fa85f64-5717-4562-b3fc-2c963f66afa6"
        ]
      }
    }
  }
}
```

### 403

```json
{
  "description": "Forbidden",
  "content": {
    "application/json": {
      "schema": {
        "type": "object",
        "properties": {
          "code": {
            "type": "integer",
            "description": "HTTP status code, duplicated in the body."
          },
          "message": {
            "type": "string",
            "description": "Human-readable message describing the error."
          },
          "errors": {
            "type": [
              "object",
              "null"
            ],
            "description": "Additional error details; null when there are none."
          }
        },
        "required": [
          "code",
          "message",
          "errors"
        ]
      },
      "examples": {
        "Example 1": {
          "summary": "Example 1",
          "value": {
            "code": 403,
            "message": "Forbidden",
            "errors": null
          }
        }
      }
    }
  },
  "headers": {
    "X-Request-Id": {
      "description": "Request identifier for tracing and support, echoed from the request or generated by Axiym.",
      "schema": {
        "type": "string",
        "format": "uuid",
        "examples": [
          "3fa85f64-5717-4562-b3fc-2c963f66afa6"
        ]
      }
    }
  }
}
```

### 404

```json
{
  "description": "Resource not found or not accessible to this integration.",
  "content": {
    "application/json": {
      "schema": {
        "type": "object",
        "properties": {
          "code": {
            "type": "integer",
            "description": "HTTP status code, duplicated in the body."
          },
          "message": {
            "type": "string",
            "description": "Human-readable explanation of the missing or inaccessible resource."
          },
          "errors": {
            "type": [
              "object",
              "null"
            ],
            "description": "Additional error details; null when there are none."
          }
        },
        "required": [
          "code",
          "message",
          "errors"
        ]
      },
      "examples": {
        "Generic": {
          "summary": "Generic",
          "value": {
            "code": 404,
            "message": "Not Found",
            "errors": null
          }
        }
      }
    }
  },
  "headers": {
    "X-Request-Id": {
      "description": "Request identifier for tracing and support, echoed from the request or generated by Axiym.",
      "schema": {
        "type": "string",
        "format": "uuid",
        "examples": [
          "3fa85f64-5717-4562-b3fc-2c963f66afa6"
        ]
      }
    }
  }
}
```

### 422

```json
{
  "description": "The request failed validation or a business rule. Validation failures return `errors` keyed by request field. Business rejections return `errors: null` and explain the reason in `message`.",
  "content": {
    "application/json": {
      "schema": {
        "type": "object",
        "properties": {
          "code": {
            "type": "integer",
            "description": "HTTP status code, duplicated in the body."
          },
          "message": {
            "type": "string",
            "description": "`Invalid Parameters` for validation failures; the rejection reason otherwise."
          },
          "errors": {
            "type": [
              "object",
              "null"
            ],
            "description": "For validation failures, keys follow the request fields and values contain field errors or nested errors. Business rejections return `null`.",
            "additionalProperties": {
              "$ref": "#/components/schemas/ValidationFieldErrors"
            }
          }
        },
        "required": [
          "code",
          "message",
          "errors"
        ]
      },
      "examples": {
        "Flat field errors": {
          "summary": "Flat field errors",
          "value": {
            "code": 422,
            "message": "Invalid Parameters",
            "errors": {
              "amount": [
                {
                  "code": "length",
                  "message": null,
                  "params": {
                    "value": "",
                    "min": 1
                  }
                }
              ],
              "recipient": {
                "destination": {
                  "currency": [
                    {
                      "code": "invalid_currency",
                      "message": null,
                      "params": {
                        "value": "ZZZ"
                      }
                    }
                  ]
                }
              }
            }
          }
        },
        "Nested struct errors": {
          "summary": "Nested struct errors",
          "value": {
            "code": 422,
            "message": "Invalid Parameters",
            "errors": {
              "sender": {
                "address": {
                  "country": [
                    {
                      "code": "invalid_country",
                      "message": null,
                      "params": {
                        "value": "INVALID"
                      }
                    }
                  ]
                }
              }
            }
          }
        },
        "List item errors": {
          "summary": "List item errors",
          "value": {
            "code": 422,
            "message": "Invalid Parameters",
            "errors": {
              "sender": {
                "relationships": {
                  "0": {
                    "firstName": [
                      {
                        "code": "length",
                        "message": null,
                        "params": {
                          "value": "",
                          "min": 1
                        }
                      }
                    ]
                  }
                }
              }
            }
          }
        },
        "Business rejection": {
          "summary": "Business rejection",
          "value": {
            "code": 422,
            "message": "Documents Not Accepted",
            "errors": null
          }
        }
      }
    }
  },
  "headers": {
    "X-Request-Id": {
      "description": "Request identifier for tracing and support, echoed from the request or generated by Axiym.",
      "schema": {
        "type": "string",
        "format": "uuid",
        "examples": [
          "3fa85f64-5717-4562-b3fc-2c963f66afa6"
        ]
      }
    }
  }
}
```

### 500

```json
{
  "description": "Unexpected server error.",
  "content": {
    "application/json": {
      "schema": {
        "type": "object",
        "properties": {
          "code": {
            "type": "integer",
            "description": "HTTP status code, duplicated in the body."
          },
          "message": {
            "type": "string",
            "description": "Human-readable message describing the error."
          },
          "errors": {
            "type": [
              "object",
              "null"
            ],
            "description": "Additional error details; null when there are none."
          }
        },
        "required": [
          "code",
          "message",
          "errors"
        ]
      },
      "examples": {
        "Example 1": {
          "summary": "Example 1",
          "value": {
            "code": 500,
            "message": "Internal Error",
            "errors": null
          }
        }
      }
    }
  },
  "headers": {
    "X-Request-Id": {
      "description": "Request identifier for tracing and support, echoed from the request or generated by Axiym.",
      "schema": {
        "type": "string",
        "format": "uuid",
        "examples": [
          "3fa85f64-5717-4562-b3fc-2c963f66afa6"
        ]
      }
    }
  }
}
```

## Operation metadata

```json
{
  "tags": [
    "Accounts"
  ],
  "operationId": "listAccounts"
}
```

## Referenced definitions

- [`#/components/parameters/RequestId`](#definition-1)
- [`#/components/parameters/First`](#definition-2)
- [`#/components/parameters/After`](#definition-3)
- [`#/components/schemas/Currency`](#definition-4)
- [`#/components/schemas/AccountStatus`](#definition-5)
- [`#/components/schemas/Account`](#definition-6)
- [`#/components/schemas/PaymentRailsCode`](#definition-7)
- [`#/components/schemas/Decimal`](#definition-8)
- [`#/components/schemas/PageInfo`](#definition-9)
- [`#/components/responses/BadRequest`](#definition-10)
- [`#/components/responses/Unauthorized`](#definition-11)
- [`#/components/responses/Forbidden`](#definition-12)
- [`#/components/responses/NotFound`](#definition-13)
- [`#/components/responses/InvalidParams`](#definition-14)
- [`#/components/schemas/ValidationFieldErrors`](#definition-15)
- [`#/components/schemas/ValidationError`](#definition-16)
- [`#/components/responses/InternalError`](#definition-17)

### definition-1

`#/components/parameters/RequestId`

```json
{
  "name": "X-Request-Id",
  "in": "header",
  "required": false,
  "description": "Optional request identifier for tracing and support. A UUID is recommended. Axiym echoes it in `X-Request-Id`, or generates one when omitted.",
  "schema": {
    "type": "string",
    "format": "uuid",
    "examples": [
      "3fa85f64-5717-4562-b3fc-2c963f66afa6"
    ]
  }
}
```

### definition-2

`#/components/parameters/First`

```json
{
  "name": "first",
  "in": "query",
  "description": "Maximum number of items to return (page size).",
  "schema": {
    "type": "integer",
    "minimum": 1,
    "maximum": 100,
    "default": 20,
    "examples": [
      20
    ]
  }
}
```

### definition-3

`#/components/parameters/After`

```json
{
  "name": "after",
  "in": "query",
  "description": "Cursor for the next page, from the previous response's pageInfo.endCursor.",
  "schema": {
    "type": "string",
    "examples": [
      "eyJvZmZzZXQiOjI1fQ=="
    ]
  }
}
```

### definition-4

`#/components/schemas/Currency`

```json
{
  "type": "string",
  "description": "Currency code — ISO 4217 (e.g. USD, EUR) or a supported digital currency (USDT, USDC).",
  "examples": [
    "USD"
  ]
}
```

### definition-5

`#/components/schemas/AccountStatus`

```json
{
  "type": "string",
  "description": "Current availability of an Axiym account.",
  "enum": [
    "ACTIVE",
    "SUSPENDED",
    "CLOSED"
  ],
  "examples": [
    "ACTIVE"
  ]
}
```

### definition-6

`#/components/schemas/Account`

```json
{
  "type": "object",
  "description": "An account holding a currency balance. Receiving details for funding it are served by the deposit instructions.",
  "required": [
    "accountId",
    "currency",
    "paymentRails",
    "balance",
    "status"
  ],
  "properties": {
    "accountId": {
      "type": "string",
      "format": "uuid",
      "description": "Account identifier (UUID).",
      "examples": [
        "5c0a9d3e-1f2b-4a6c-8e7d-9b3f5a1c2d4e"
      ]
    },
    "currency": {
      "$ref": "#/components/schemas/Currency",
      "description": "Account currency.",
      "examples": [
        "USD"
      ]
    },
    "paymentRails": {
      "$ref": "#/components/schemas/PaymentRailsCode",
      "description": "Rail the account settles on.",
      "examples": [
        "ZENUS_BANK"
      ]
    },
    "balance": {
      "allOf": [
        {
          "$ref": "#/components/schemas/Decimal"
        }
      ],
      "description": "Current balance.",
      "examples": [
        "48250.00"
      ]
    },
    "status": {
      "$ref": "#/components/schemas/AccountStatus",
      "description": "Account status.",
      "examples": [
        "ACTIVE"
      ]
    }
  }
}
```

### definition-7

`#/components/schemas/PaymentRailsCode`

```json
{
  "type": "string",
  "description": "Code identifying the payment rail connected to the Axiym account, such as `ZENUS_BANK` or `TRON`. This is separate from the method used to deliver a payout.",
  "examples": [
    "ZENUS_BANK"
  ]
}
```

### definition-8

`#/components/schemas/Decimal`

```json
{
  "type": "string",
  "description": "Decimal number serialized as a string to preserve precision.",
  "examples": [
    "1000.00"
  ]
}
```

### definition-9

`#/components/schemas/PageInfo`

```json
{
  "type": "object",
  "description": "Cursor information for a paginated response.",
  "properties": {
    "hasNextPage": {
      "type": "boolean",
      "description": "When paginating forwards, are there more items?",
      "examples": [
        true
      ]
    },
    "endCursor": {
      "type": "string",
      "description": "When paginating forwards, the cursor to continue.",
      "examples": [
        "eyJvZmZzZXQiOjI1fQ=="
      ]
    }
  },
  "required": [
    "hasNextPage"
  ]
}
```

### definition-10

`#/components/responses/BadRequest`

```json
{
  "description": "Malformed or invalid request.",
  "content": {
    "application/json": {
      "schema": {
        "type": "object",
        "properties": {
          "code": {
            "type": "integer",
            "description": "HTTP status code, duplicated in the body."
          },
          "message": {
            "type": "string",
            "description": "Human-readable message describing the error."
          },
          "errors": {
            "type": [
              "object",
              "null"
            ],
            "properties": {
              "message": {
                "type": "string"
              }
            },
            "description": "Additional error details; null when there are none."
          }
        },
        "required": [
          "code",
          "message",
          "errors"
        ]
      },
      "examples": {
        "Malformed JSON body": {
          "summary": "Malformed JSON body",
          "value": {
            "code": 400,
            "message": "Bad Request",
            "errors": {
              "message": "Failed to parse the request body as JSON: expected value at line 1 column 5"
            }
          }
        },
        "Generic": {
          "summary": "Generic",
          "value": {
            "code": 400,
            "message": "Invalid cursor",
            "errors": null
          }
        }
      }
    }
  },
  "headers": {
    "X-Request-Id": {
      "description": "Request identifier for tracing and support, echoed from the request or generated by Axiym.",
      "schema": {
        "type": "string",
        "format": "uuid",
        "examples": [
          "3fa85f64-5717-4562-b3fc-2c963f66afa6"
        ]
      }
    }
  }
}
```

### definition-11

`#/components/responses/Unauthorized`

```json
{
  "description": "Missing, expired, or invalid credentials.",
  "content": {
    "application/json": {
      "schema": {
        "type": "object",
        "properties": {
          "code": {
            "type": "integer",
            "description": "HTTP status code, duplicated in the body."
          },
          "message": {
            "type": "string",
            "description": "Human-readable message describing the error."
          },
          "errors": {
            "type": [
              "object",
              "null"
            ],
            "description": "Additional error details; null when there are none."
          }
        },
        "required": [
          "code",
          "message",
          "errors"
        ]
      },
      "examples": {
        "Example 1": {
          "summary": "Example 1",
          "value": {
            "code": 401,
            "message": "Unauthorized",
            "errors": null
          }
        }
      }
    }
  },
  "headers": {
    "X-Request-Id": {
      "description": "Request identifier for tracing and support, echoed from the request or generated by Axiym.",
      "schema": {
        "type": "string",
        "format": "uuid",
        "examples": [
          "3fa85f64-5717-4562-b3fc-2c963f66afa6"
        ]
      }
    }
  }
}
```

### definition-12

`#/components/responses/Forbidden`

```json
{
  "description": "Forbidden",
  "content": {
    "application/json": {
      "schema": {
        "type": "object",
        "properties": {
          "code": {
            "type": "integer",
            "description": "HTTP status code, duplicated in the body."
          },
          "message": {
            "type": "string",
            "description": "Human-readable message describing the error."
          },
          "errors": {
            "type": [
              "object",
              "null"
            ],
            "description": "Additional error details; null when there are none."
          }
        },
        "required": [
          "code",
          "message",
          "errors"
        ]
      },
      "examples": {
        "Example 1": {
          "summary": "Example 1",
          "value": {
            "code": 403,
            "message": "Forbidden",
            "errors": null
          }
        }
      }
    }
  },
  "headers": {
    "X-Request-Id": {
      "description": "Request identifier for tracing and support, echoed from the request or generated by Axiym.",
      "schema": {
        "type": "string",
        "format": "uuid",
        "examples": [
          "3fa85f64-5717-4562-b3fc-2c963f66afa6"
        ]
      }
    }
  }
}
```

### definition-13

`#/components/responses/NotFound`

```json
{
  "description": "Resource not found or not accessible to this integration.",
  "content": {
    "application/json": {
      "schema": {
        "type": "object",
        "properties": {
          "code": {
            "type": "integer",
            "description": "HTTP status code, duplicated in the body."
          },
          "message": {
            "type": "string",
            "description": "Human-readable explanation of the missing or inaccessible resource."
          },
          "errors": {
            "type": [
              "object",
              "null"
            ],
            "description": "Additional error details; null when there are none."
          }
        },
        "required": [
          "code",
          "message",
          "errors"
        ]
      },
      "examples": {
        "Generic": {
          "summary": "Generic",
          "value": {
            "code": 404,
            "message": "Not Found",
            "errors": null
          }
        }
      }
    }
  },
  "headers": {
    "X-Request-Id": {
      "description": "Request identifier for tracing and support, echoed from the request or generated by Axiym.",
      "schema": {
        "type": "string",
        "format": "uuid",
        "examples": [
          "3fa85f64-5717-4562-b3fc-2c963f66afa6"
        ]
      }
    }
  }
}
```

### definition-14

`#/components/responses/InvalidParams`

```json
{
  "description": "The request failed validation or a business rule. Validation failures return `errors` keyed by request field. Business rejections return `errors: null` and explain the reason in `message`.",
  "content": {
    "application/json": {
      "schema": {
        "type": "object",
        "properties": {
          "code": {
            "type": "integer",
            "description": "HTTP status code, duplicated in the body."
          },
          "message": {
            "type": "string",
            "description": "`Invalid Parameters` for validation failures; the rejection reason otherwise."
          },
          "errors": {
            "type": [
              "object",
              "null"
            ],
            "description": "For validation failures, keys follow the request fields and values contain field errors or nested errors. Business rejections return `null`.",
            "additionalProperties": {
              "$ref": "#/components/schemas/ValidationFieldErrors"
            }
          }
        },
        "required": [
          "code",
          "message",
          "errors"
        ]
      },
      "examples": {
        "Flat field errors": {
          "summary": "Flat field errors",
          "value": {
            "code": 422,
            "message": "Invalid Parameters",
            "errors": {
              "amount": [
                {
                  "code": "length",
                  "message": null,
                  "params": {
                    "value": "",
                    "min": 1
                  }
                }
              ],
              "recipient": {
                "destination": {
                  "currency": [
                    {
                      "code": "invalid_currency",
                      "message": null,
                      "params": {
                        "value": "ZZZ"
                      }
                    }
                  ]
                }
              }
            }
          }
        },
        "Nested struct errors": {
          "summary": "Nested struct errors",
          "value": {
            "code": 422,
            "message": "Invalid Parameters",
            "errors": {
              "sender": {
                "address": {
                  "country": [
                    {
                      "code": "invalid_country",
                      "message": null,
                      "params": {
                        "value": "INVALID"
                      }
                    }
                  ]
                }
              }
            }
          }
        },
        "List item errors": {
          "summary": "List item errors",
          "value": {
            "code": 422,
            "message": "Invalid Parameters",
            "errors": {
              "sender": {
                "relationships": {
                  "0": {
                    "firstName": [
                      {
                        "code": "length",
                        "message": null,
                        "params": {
                          "value": "",
                          "min": 1
                        }
                      }
                    ]
                  }
                }
              }
            }
          }
        },
        "Business rejection": {
          "summary": "Business rejection",
          "value": {
            "code": 422,
            "message": "Documents Not Accepted",
            "errors": null
          }
        }
      }
    }
  },
  "headers": {
    "X-Request-Id": {
      "description": "Request identifier for tracing and support, echoed from the request or generated by Axiym.",
      "schema": {
        "type": "string",
        "format": "uuid",
        "examples": [
          "3fa85f64-5717-4562-b3fc-2c963f66afa6"
        ]
      }
    }
  }
}
```

### definition-15

`#/components/schemas/ValidationFieldErrors`

```json
{
  "description": "Nested validation errors keyed by field name or array index. Leaf values are arrays of `ValidationError` objects.",
  "oneOf": [
    {
      "type": "array",
      "items": {
        "$ref": "#/components/schemas/ValidationError"
      }
    },
    {
      "type": "object",
      "additionalProperties": {
        "$ref": "#/components/schemas/ValidationFieldErrors"
      },
      "properties": {}
    }
  ]
}
```

### definition-16

`#/components/schemas/ValidationError`

```json
{
  "type": "object",
  "description": "One field-level validation error.",
  "required": [
    "code",
    "params"
  ],
  "properties": {
    "code": {
      "type": "string",
      "description": "Machine-readable validation rule code, such as `length`, `email`, or `invalid_currency`.",
      "examples": [
        "length"
      ]
    },
    "message": {
      "type": [
        "string",
        "null"
      ],
      "description": "Human-readable message.",
      "examples": [
        "string"
      ]
    },
    "params": {
      "type": "object",
      "description": "Rule-specific parameters, including `value`, the submitted input. Values may contain sensitive data; do not log them without redaction.",
      "properties": {
        "value": {
          "description": "The submitted value that failed validation.",
          "examples": [
            "string"
          ]
        }
      }
    }
  }
}
```

### definition-17

`#/components/responses/InternalError`

```json
{
  "description": "Unexpected server error.",
  "content": {
    "application/json": {
      "schema": {
        "type": "object",
        "properties": {
          "code": {
            "type": "integer",
            "description": "HTTP status code, duplicated in the body."
          },
          "message": {
            "type": "string",
            "description": "Human-readable message describing the error."
          },
          "errors": {
            "type": [
              "object",
              "null"
            ],
            "description": "Additional error details; null when there are none."
          }
        },
        "required": [
          "code",
          "message",
          "errors"
        ]
      },
      "examples": {
        "Example 1": {
          "summary": "Example 1",
          "value": {
            "code": 500,
            "message": "Internal Error",
            "errors": null
          }
        }
      }
    }
  },
  "headers": {
    "X-Request-Id": {
      "description": "Request identifier for tracing and support, echoed from the request or generated by Axiym.",
      "schema": {
        "type": "string",
        "format": "uuid",
        "examples": [
          "3fa85f64-5717-4562-b3fc-2c963f66afa6"
        ]
      }
    }
  }
}
```