Error: Payment Console Settings save error - this is because settings are saved using custom metadata
Debugger shows the following message.
Solution: Enable the following settings.
Error: Payment Terminal does not show credit number fields.
Solution: Setup a trusted domain.
Solution: turn off Enable Sender ID compliance in the Setup\Email\Deliverability.
Issue: Why there is a tiny box to the right of the Pay Now button?
Solution: It is added by Salesforce automatically because Enable Email Tracking is checked under Setup\Featture Settings\Sales\Activity Settings.