It is important to have Proof of Payment Authorization from an authorized cardholder on the buyer's account before processing payments. This can be in the form of a BizX authorization slip, a signed receipt, a signed invoice or an email confirming you are authorized to charge their account for the specified amount.
For any purchases made on the BizX Marketplace there is inherent proof of payment authorization since they must be signed in to purchase online items.
If a dispute were to arise in the future and you do not have this proof of payment authorization then all disputed transactions will be reversed.