---
title: "Submit Bank Account Material Supplement"
method: POST
path: "/withdraw/open/otc/api/bank/material/supplement"
---

# Submit Bank Account Material Supplement

`POST /withdraw/open/otc/api/bank/material/supplement`

Submit additional KYC or compliance documents for an existing linked OTC bank account when GatePay requests a material supplement (for example after add-bank review or when the account is pending additional proof).

## Headers

- `X-GatePay-Certificate-ClientId` string, required
- `X-GatePay-Signature` string, required
- `X-GatePay-Timestamp` string, required
- `X-GatePay-Nonce` string, required

## Response `200`

Success

- BankMaterialSupplementResponse
  - `code` string — Business response code.
  - `status` string — Top-level request status.
  - `errorMessage` string — Error message when the request fails.
  - `data` boolean — `true` when the supplementary materials have been accepted for processing; `false` otherwise. The final review outcome is still determined by the bank account status returned in Query Bank Account List.

---

[API](https://skmtc.net/gate/apis/gatepay-otc-fiat-api.md) · [All operations](https://skmtc.net/gate/apis/gatepay-otc-fiat-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/gate/gatepay-otc-fiat-api/revisions/c57d5cf03098/schema)