Hello,
I get an error: "GET to callback URL does not return 200", so I did a test, as mentioned in Troubleshooting Tips, by sending a GET request to my callback URL. The test worked fine and the response is under 2 seconds.
I would appreciate some feedback on this matter. I have also attached 2 images showing the process. In the first image, there is a POST request to the subscription endpoint with a status of 400, while the second is a test to my callback URL with a status of 200.
Am I missing something here? Thank you for your help.