Adaptive Payment Error Message in Sandbox

[pfaccess]

Hello,

A membership purchase was made with our LIVE mode adaptive payment system that should have been $1470 + $285.33 or $1755.33 followed by 11 months of $285.33 recurring payments. Instead, the system charged only $285.33 but three separate charges within a second of each other. We went back to Sandbox mode to retest, but now we get this message:

I am getting below error response for "Pay" method of adaptive payments.
Array
(
[0] => responseEnvelope.timestamp=2017-02-28T01%3A56%3A51.915-08%3A00
[1] => responseEnvelope.ack=Failure
[2] => responseEnvelope.correlationId=82ef9b5bbe866
[3] => responseEnvelope.build=30051544
[4] => error(0).errorId=520002
[5] => error(0).domain=PLATFORM
[6] => error(0).subdomain=Application
[7] => error(0).severity=Error
[8] => error(0).category=Application
[9] => error(0).message=Internal+Error
[10] => error(0).parameter(0)=AppId+is+invalid
)

Do we need new regenerated credentials and test again? Looking forward to a solution. 

Thanks,

Jeff

[MTS_Ciaran]

The error indicates that there is an issue with the App ID, are you using the default sandbox APP ID for testing on sandbox i.e. APP-80W284485P519543T. Also have you switched your live credentials over to your sandbox account API credentials?

[pfaccess]

Thanks for responding. Yes, the Sandbox APP ID is correct as you show. We have new (regenerated credentials) for password, signature, etc. 

[angelleye]

I have a sample Pay script setup here that is working just fine in the sandbox.  I haven't seen any other reports of issues with the Adaptive Payments sandbox either, so I think there must be something going on with your credentials.

Can you provide a sample of the request you're sending?  Are you sure you're sending the request to the sandbox endpoint and not the live endpoint by accident?