I'm an expert with PayPal and have done this numerous times. I just recently did something similar with [login to view URL] for their purchase of ad placement (picking the dates). I have several examples of PayPal work in my portfolio. This won't take long at all which is why my bid is lower than the rest. I've done trial payments, and also recurring. The way we do it is we do it as a trial, then set the end of the trial to be the date they selected for payment and then have it be a monthly subscription for the amount specified. Best to use Paypal Payments Standard as all this can be done with it and I will explain more about why in chat. Let's chat, I'm very sure I'm the best man for the job. Also, I can show you as many examples as you want that I've done this many, many times in chat.