RequestError

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://github.com/api-evangelist/gov-uk-pay/blob/main/json-schema/RequestError.json",
  "title": "RequestError",
  "type": "object",
  "description": "A Request Error response",
  "properties": {
    "code": {
      "type": "string",
      "description": "An [API error code](https://docs.payments.service.gov.uk/api_reference/#gov-uk-pay-api-error-codes)that explains why the payment failed.<br><br>`code` only appears if the payment failed.",
      "example": "P0102"
    },
    "description": {
      "type": "string",
      "description": "Additional details about the error.",
      "example": "Invalid attribute value: amount. Must be less than or equal to 10000000"
    },
    "field": {
      "type": "string",
      "description": "The parameter in your request that's causing the error.",
      "example": "amount"
    },
    "header": {
      "type": "string",
      "description": "The header in your request that's causing the error.",
      "example": "Idempotency-Key"
    }
  }
}