Connecting To Authorization Endpoint - OAuth Authorization Flow

  • 17 May 2021
  • 1 reply


I’m trying to test Acumatica’s OAuth Authorization flow using Postman. I need to implement an API that will generally be called from a website (our customer portal) and return some information from our company’s Acumatica via OData.

I followed the steps in the I300 Web Services course:

as well as in the reference documents:

I am able to use the Resource Owner Password Credentials flow successfully, but we need to implement the Authorization flow, using a client_id + client_secret approach.

I already created a Client in the Connected Applications screen, and set the flow to Authorization Code.

Please correct me if I’m wrong: I understand that every time this API will be called, it will need to first request an authorization code from (GET) https://<Acumatica ERP instance URL>/identity/connect/authorize, and then use that code to get a token from (GET) https://<Acumatica ERP instance URL>/identity/connect/token. Then that token can be used to successfully authenticate our main API call to retrieve information from OData.

When I try to test the first part of this process in Postman (retrieving the authorization code) I’m just getting this:

If I try the URL directly in the browser with the same parameters, I get this:


Could you please let me know what am I doing wrong?

I’m currently using as the redirect uri value (and I also included it in the client’s Redirect URIs page in the Connected Applications screen in Acumatica). In fact I would also like to know what should I use as the redirect uri if all this will be initially triggered by a javascript function when the website loads, which will trigger an API call to a function in AWS, which will run the authentication/token calls above.

(Any comments or suggestions to help improve this process are more than welcome)


Thanks in advance!

1 reply

Please disregard this question. I was able to finally make it work.
For some reason when I disactivated and activated the client in the connected applications screen, it started working properly.


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