Control over transactions using DSP Merchant Services

Some transactions on statements are not sales and are instead a collection of funds to be transferred on to other parties. If processed using merchant services then transaction fees apply which deduct from the amount transferred and therefore for accounting purposes this causes issues as amounts received and amounts due are not the same. Example: Studio is collecting ticket money for an external provider and needs to send the exact amount on to the provider from students. If we use Merchant Services, then we receive less than we need to transfer on which causes accounting issues. If we had control over which transactions could be paid via merchant services and which ones didn't have that option and have to be paid cash/bank transfer, it would make this possible.