System Error 21359 on Trading API's GET Requests

[lev449]

I was testing several GET requests (GetNotificationPreferences, GetNotificationsUsage, GetCategories, etc.) in Postman. About a month ago, everything was working fine. Couple days ago I went to make these calls again, and I keep receiving 21359 system errors (Input transfer has been terminated because your request timed out).  The off thing is, a POST request to SetNotificationPreferences works fine. I have been receiving this system error for the last 3 days, and I am not entirely sure what could be the issue.

Let me know if more information is necessary and thanks for the help in advance!

[developer_support@ebay · Accepted solution]

Hi @lev449 

The Trading API expects calls to use the HTTP POST call method. Please use the HTTP POST method for executing the Trading API calls. 

For more details, please see Making a Trading API Call.