There are several payment methods available for buyers and agencies:

All major credit cards are accepted. You can set recurrent payment for professional services and/or support services.
Once you choose to pay with credit card, you are redirected to a built-in payment page where you  submit credit card details. You can save card for future use and see items included in the purchase.
After payment is successfully completed, you can download/save payment receipt.

System adds VAT (in accordance with buyer market VAT) on top of each purchase.

2. Payment by invoice

Buyers can  also pay for campaign booking or professional services with invoice, if
such option is allowed by admin for the corresponding market or particular user. 

If you choose to pay by invoice, you are redirected to invoice confirmation page where you can select invoice delivery method and items included in the purchase.

Payment history is available for all the purchases made by the buyers.