Thanks for the response.  I already have my customers setup for taking online payments.  Let me explain the problem further.  For instance: Let's say I invoice Customer XYZ manually for some prints.  When I start a new invoice for their company, email later is already checked when I select them.  After entering the item info, and saving the invoice, if I go to send forms, the XYZ invoice is listed and below the email template info there will be a note that says "This customer can pay due invoices online.".  If I use Zed Axis to import an invoice for the same customer, the email later is checked so it will show up in my send forms window but the note about receiving payment online is not there.  To remedy I am removing it from the send forms, opening the invoice back up, putting the check mark back into the email later box, saving, then using send forms and the pay online is there.  So the issue seems to be the selection of the customer.  When done manually, online payments work.  When imported, even though it is selecting the exact same customer account, the online payment feature fails.