Customer support does not answer questions regarding the API and it is best if you post them to the forum. API questions require a lot of time since one never knows where the problem lies and requires investigation of code.
I spoke with support about your question & I was told that they had referred you to the forum. Forum is the only support service for API as it is monitored by developers and programmers & geeks like me

Account GUID:
Steps:
- Login to the administrative portal
- Click on Account Info
- Click on API Information
- Copy the API Account GUID
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