> ## Documentation Index
> Fetch the complete documentation index at: https://docs.natural.com/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> When building application code, use `@naturalpay/sdk` for TypeScript or `naturalpay` for Python.
> When operating Natural directly for a user, use the payments MCP at `https://mcp.natural.com`.
> When searching Natural documentation, use the docs MCP at `https://docs.natural.com/mcp`.
> Use the Natural CLI for terminal and CI automation.
> Use REST only for unsupported languages or when the user explicitly requests raw HTTP.
> Start integration development and testing in the sandbox. Do not use production unless the user explicitly requests it.
> For sandbox requests that require `customerPartyId`, list customers first. Reuse only the intended fixture; otherwise create a customer.
> REST and SDK amounts use integer minor units. Payments MCP amounts use decimal strings with a required currency code.

# Refunds

> Public error codes for Refunds API endpoints

All error responses follow the standard [error format](/api-reference/errors/error-handling).
Validation errors (422) and rate limit errors (429) apply to all endpoints and are documented in the [Error Handling guide](/api-reference/errors/error-handling).

| Code | Status | Detail |
| - | - | - |
| `invalid_pagination_cursor` | 400 | The page cursor is not valid. Start the list again. |
| `invalid_value` | 400 | The information you entered isn't valid. Please check it and try again. |
| `refund_already_fully_refunded` | 400 | This payment has already been fully refunded. |
| `refund_amount_exceeds_refundable` | 400 | The refund amount is more than what remains refundable on this payment. |
| `refund_capture_not_accepted` | 400 | The original card payment was not accepted by the processor. |
| `refund_capture_not_reversible` | 400 | The original card payment cannot be reversed by the processor. |
| `refund_invalid_amount` | 400 | The refund amount must be positive and in the payment's currency. |
| `refund_payment_not_refundable` | 400 | This payment intent has no successful card payment to refund. |
| `unauthenticated` | 401 | Authentication is required. |
| `forbidden` | 403 | You do not have permission to perform this action. |
| `party_mismatch` | 403 | You can only act for your own party or a party that has authorized you. |
| `refund_not_found` | 404 | Refund not found. |
| `already_exists` | 409 | The resource already exists. |
| `conflict` | 409 | The request conflicts with the current resource state. |
| `insufficient_funds` | 409 | Your wallet balance is too low to fund this refund. |
| `refund_blocked_by_chargeback` | 409 | A chargeback on this payment prevents refunds unless it is resolved in your favor. |
| `refund_in_flight` | 409 | The processor is still working on another refund for this payment. |
| `refund_in_progress` | 409 | Another refund for this payment is still in progress. |
| `refund_sandbox_unavailable` | 409 | Sandbox refunds are not available in this environment yet. |
| `rate_limited` | 429 | Too many requests. Please try again later. |
| `server_error` | 500 | Something went wrong. |
| `bad_gateway` | 502 | We couldn't complete that request because one of Natural's services returned an unexpected response. Please try again. |
| `bad_gateway` | 502 | Natural could not complete the request because one of its services returned an unexpected response. Try again. |
| `service_unavailable` | 503 | The service is temporarily unavailable. |


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