This depends on the bank or bank clerk you work with.

Banks generally do not work directly with individuals on credit card processing. The bank has its own systematic management model. Different employees have different responsibilities. Generally you can only work with the business privately. This kind of cooperation generally does not have a written agreement. You have to agree on the commission ratio and give it to you later. The specific amount depends on the private negotiation between you. There is no specific explicit rule on this.