Customer payment error SLN74629 and HOW21175
I tried entering a customer's payment with the card number they gave me (and yes, it is a good number). I got error code SLN74629 and HOW21175. It said there was a connection error. However, the next customer whose cc I entered went through. I tried the previous customer again and got the same error code. It's not the internet/connection as other payments are processed with no issue. Any help is appreciated.
