# USE\_ONE\_TIME\_TOKEN **Type**: `boolean` **Default**: `true` **Description**: Controls whether a single-use token is appended to redirection payment callback URLs. * When `true`: A one-time token is generated at the start of the redirection flow and appended to both the success and failure callback URLs. On return, the token is validated to prevent session replay attacks. * When `false`: No token validation is performed; the callback URL is accepted without replay protection. **Used in**: `RedirectionPageCompletePage` — token validation on payment provider callback return. Also used in `WalletPaymentPage` — token appended to wallet redirect success/fail callback URLs. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://apidocs.akinon.com/commerce-openapis/checkout/env-settings/use_one_time_token.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.