You're trying to keep your identity anonymous from the model or producer you are trying to hire? Well, assuming they don't ask you for proof that you're over 18 (some do, some don't), you can always mail them an international money order in the denomination of their country. This is assuming they are agreeable. You are of course taking a chance that it won't get lost or that the person you are dealing with is honest.
I don't think you can fund PayPal with "credit", although you can with a debit card, so I don't know for sure. If you can, it wouldn't be fake or anything, you're supposed to be able to use those cards like credit cards. I'm just not sure it will allow you.
PayPal aside, however, I'm fairly certain you can just use a prepaid card directly on Clips4Sale.