Submit Bank Account Material Supplement
Submit additional KYC or compliance documents for an existing linked OTC bank account when GatePay requests a material supplement.
Overview
This page documents thePOST /withdraw/open/institution/otc/api/bank/material/supplement 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 institution OTC path.
- Institution mirror merchant endpoints typically require
X-GatePay-On-Behalf-Of, except for institution-only account, transfer, and charge endpoints. - For shared signing rules, see /global/api-reference/version/100/en/common/securityAndSignature.
- Limits: At most 5 files per non-empty list; each file must be non-empty and 4 MB or smaller; allowed filename extensions:
jpg,jpeg,png,pdf.
Headers
Merchant application client ID used to identify the calling app.
HMAC signature generated from the request according to GatePay signing rules.
Millisecond timestamp; the difference from server time must not exceed 30 seconds.
Random nonce used together with the timestamp to prevent replay attacks.
Required delegated-subject header. Provide the initiating account ID for this request. For institution merchant APIs, this is typically the target sub-account ID; for institution charge and transfer APIs, it can be either an institution account ID or a sub-account ID.
Body
Supplementary document upload for a linked bank account. See each property for the material type; bankAccountId targets the account.
Linked bank account ID (bankAccountId from Query Bank Account List or Create Bank Account) for the same institutional (on-behalf-of) context.
Company registration / incorporation certificate, business license, or equivalent corporate identity documents.
1 - 5 elementsPassport or other government-issued ID for relevant individuals.
1 - 5 elementsShareholder register or ownership documentation.
1 - 5 elementsShareholding / beneficial ownership structure chart.
1 - 5 elementsAny other documents explicitly requested in the supplement notice.
5Response
Success
Business response code.
Top-level request status.
Error message when the request fails.
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.

