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

# Query Refund Supported Networks

> Query supported networks for refund currencies. Returns chain information for the given order currency.

## Overview

This page documents the `GET /payment/open/institution/v2/refund/support/chains` endpoint. The full schema, parameters, and examples are rendered from the linked OpenAPI definition above.

## Notes

* Authentication uses the standard GatePay signed headers.
* This page documents the institutional path version of the same endpoint.
* For shared signing rules, see [/api-reference/version/100/en/common/securityAndSignature](/api-reference/version/100/en/common/securityAndSignature).

## Institution Notes

* Institutional requests must include `X-GatePay-On-Behalf-Of` to specify the institutional sub-account to operate on.


## OpenAPI

````yaml /api-reference/version/100/en/openapi/institution/checkout-payment-openapi.json GET /payment/open/institution/v2/refund/support/chains
openapi: 3.1.0
info:
  title: GatePay API
  description: >-
    GatePay Checkout Payment API - Create orders at the cashier, process
    refunds, and query order/refund details.
  license:
    name: MIT
  version: 1.0.0
servers:
  - url: https://openplatform.gateapi.io
security: []
paths:
  /payment/open/institution/v2/refund/support/chains:
    get:
      summary: Query Refund Supported Chains
      description: >-
        Query supported networks for refund currencies. Returns chain
        information for the given order currency.
      parameters:
        - $ref: '#/components/parameters/X-GatePay-Certificate-ClientId'
        - $ref: '#/components/parameters/X-GatePay-Signature'
        - $ref: '#/components/parameters/X-GatePay-Timestamp'
        - $ref: '#/components/parameters/X-GatePay-Nonce'
        - $ref: '#/components/parameters/currency'
      responses:
        '200':
          description: Supported chains retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/RefundChainsResponse'
              examples:
                successResponse:
                  summary: Success Response
                  value:
                    code: '000000'
                    data:
                      currency: USDT
                      chains:
                        - chain: MATIC
                          currency: USDT
                          symbol: null
                          hasWithdrawMemo: 0
                          withdrawPercent: '0'
                          withdrawFix: '1'
                          full_curr_type: ''
                          explorer_url: null
                          show_chain_name_en: MATIC
                    status: SUCCESS
                    errorMessage: ''
components:
  parameters:
    X-GatePay-Certificate-ClientId:
      name: X-GatePay-Certificate-ClientId
      in: header
      required: true
      description: Merchant client ID, obtained from GatePay platform
      schema:
        type: string
        example: 4186d0c6-6a35-55a9-8dc6-5312769dbff8
    X-GatePay-Signature:
      name: X-GatePay-Signature
      in: header
      required: true
      description: HMAC-SHA256 signature for request validation
      schema:
        type: string
        example: >-
          672d5650dcc9bb22ebf25fa16c28d03c0e159d742a9176d4340a5da326d75dc8a2ec24c97fa6fc5d1533dd6e968863747e1d86a45e562cbe899f9ed7e9ca7f77
    X-GatePay-Timestamp:
      name: X-GatePay-Timestamp
      in: header
      required: true
      description: >-
        Timestamp in milliseconds, must not differ from server time by more than
        5 minutes
      schema:
        type: string
        example: '1672905655498'
    X-GatePay-Nonce:
      name: X-GatePay-Nonce
      in: header
      required: true
      description: Random nonce for replay attack prevention
      schema:
        type: string
        example: '9578'
    currency:
      name: currency
      in: query
      required: true
      description: Order currency
      schema:
        type: string
        example: USDT
  schemas:
    RefundChainsResponse:
      type: object
      properties:
        status:
          type: string
          description: Response status
        code:
          type: string
          description: Response code
        errorMessage:
          type: string
          description: Error message
        data:
          $ref: '#/components/schemas/RefundChainsData'
    RefundChainsData:
      type: object
      properties:
        currency:
          type: string
          description: Order currency
        chains:
          type: array
          items:
            $ref: '#/components/schemas/ChainItem'
          description: Supported chains for refund
    ChainItem:
      type: object
      properties:
        chain:
          type: string
          description: Chain name
        currency:
          type: string
          description: Currency
        full_curr_type:
          type: string
          description: Full currency type
        symbol:
          type: string
          description: Symbol
        explorer_url:
          type: string
          description: Blockchain explorer URL
        show_chain_name_en:
          type: string
          description: Chain name in English
        hasWithdrawMemo:
          type: integer
          description: Whether memo is required for withdrawal
        withdrawPercent:
          type: string
          description: Withdrawal percentage fee
        withdrawFix:
          type: string
          description: Fixed withdrawal fee

````