Credit card payments being declined in Merchant Services Center
I am attempting to receive my first credit card payments from a customer. I did a test charge for $5 and it worked. But all other charges for higher amounts were declined. We even tried two of the customer's other cards and all were declined. Is the service center somehow not allowing me to accept these payments ($500, $3400), and if so, what do I do to fix this? Or is it more likely his bank disallowing the charge? Thanks in advance for your help!