if its small amount like ten dollars something like that you can receive the payment or if its small amount like 1 or 2 dollars its better to deal directly with the user...ask him to pay first for your service at the begining everybody will be hesitant to pay you first so you need to build trust level that first vouch your service to any 3 or 4 hero or legendary members or green trust members of this forum in that way people will start trusting you...