Some common errors to look out for/check are:
- Error: Read timed out
This is saying that Salesforce is taking too long to respond. The timeout limit is 2 minutes.
You can check for performance degradations of Salesforce service at trust.salesforce.com.
If this is still happening in say an hours time, then please submit another ticket. We believe this is at Salesforce end and not much we can do at this stage.
- Error: You have uncommitted work pending. Please commit or rollback before calling out
This error occurs as a result of another error. Please check your Payments2us Error Log to see if there is any other error logged after the "Payments2UsDML - Callout Exception You have uncommitted work pending". You will need to solve that error in order to stop receiving further these errors.