# Payments This API can be used to initiate and manage payment requests for your own $TOKEN, allowing you to seamlessly accept payments from users. ### ERC20 Permit This feature relies on the ERC20 Permit extension. ERC20 Permit is an extension to the ERC20 token standard that allows users to pre-approve a token transfer that anyone can execute on their behalf. {% hint style="info" %} If you are using your own ERC20 contract, you **MUST** implement ERC20 Permit in order to use the TokenOS Payments API. {% endhint %} In order for the end user to sign the permit with their wallet, you will need to implement the following flow within your application: * Create a payment request * Use our returned parameters to ask your user to sign a permit * Post back the permit * Poll the payment request for its status, or be notified by web hook {% openapi src="" path="/payments" method="post" %} [payment-api.yaml](https://2025772754-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FKOyoBDhx8ymvd9xgu92d%2Fuploads%2FeMLXfUneO8e88VmJxNsa%2Fpayment-api.yaml?alt=media\&token=dc57db6b-734f-4ae1-9583-af480d989048) {% endopenapi %} {% openapi src="" path="/payments/{requestId}" method="get" %} [payment-api.yaml](https://2025772754-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FKOyoBDhx8ymvd9xgu92d%2Fuploads%2FeMLXfUneO8e88VmJxNsa%2Fpayment-api.yaml?alt=media\&token=dc57db6b-734f-4ae1-9583-af480d989048) {% endopenapi %} ### Conversion Rate If you have an existing points program, you'll likely establish a fixed or variable conversion rate from your own points to your own $TOKEN. Payment requests can also save a conversion rate. This feature allows you to atomically create a payment request and retain a conversion rate that you have computed on your end. This can be especially useful if you need to lock in a specific exchange rate for a particular transaction.