# Oauth error 202 invalid expiration date **URL:** \ **Category:** API and Webhooks\ **Created:** [August 8, 2023, 1:21am UTC](https://devforum.zoom.us/t/oauth-error-202-invalid-expiration-date/93065 "2023-08-08T01:21:29Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![elisa.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/elisa.zoom/32/47836_2.png) [@elisa.zoom](https://devforum.zoom.us/u/elisa.zoom)\ **Post date:** [August 9, 2023, 4:44pm UTC](https://devforum.zoom.us/t/oauth-error-202-invalid-expiration-date/93065/4 "2023-08-09T16:44:29Z")
Thanks for sharing that with me @chris14 It looks like you are using an Oauth app to authorize. What I can see is that you are trying to authorize and get the token at the same time and it should be done in 2 steps. First, you authorize the app (using the app credentials), once that’s done then you can generate the access token Here is a helpful guide on how to make API calls with Oauth using Postman > [@Guide: Making a Zoom API Call with OAuth Credentials in Postman](https://devforum.zoom.us/t/guide-making-a-zoom-api-call-with-oauth-credentials-in-postman/64538): > > To publish an app on the Zoom Marketplace you must create an [OAuth app](https://marketplace.zoom.us/docs/guides/build/oauth-app/). When you’re ready to test making API calls, download the latest version of Postman and import the Zoom API collections following the steps outlined [here](https://marketplace.zoom.us/docs/guides/guides/postman/using-postman-to-test-zoom-apis/). There are Three Ways to Set up OAuth in Postman to Make API Requests We’re going to go through three ways to set up our OAuth application credentials to successfully authorize and access the Zoom API to make requests. The “Easy” Difficulty OAuth 2.0 Set Up in Postman We’… Also, take a look at this sample app that might help you understand the workflow better > **[GitHub - zoom/zoom-oauth-sample-app: Sample Zoom Oauth App NodeJS app to call Zoom's...](https://github.com/zoom/zoom-oauth-sample-app)** > > Sample Zoom Oauth App NodeJS app to call Zoom's APIs --- _[View the full topic](https://devforum.zoom.us/t/oauth-error-202-invalid-expiration-date/93065)._