Hi Jason I'm Robert and I work at PayPal Merchant Technical Services (https://www.paypal.com/mts/) Website Payments Standard subsciptions (what you're looking at using) does not support a certain start date. WPS Subscriptions start on the day the buyer subscribes to them. You could dynamically alter a trial period to work around this, but it's far from ideal. Ideally, you'd want to use Express Checkout with Recurring Payments, which has a PROFILESTARTDATE parameter (the date you wish the recurring payments profile to start on). See https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_api_ECRecurringPayments for further information. Note: Express Checkout works through our API's and includes a redirect to the PayPal site for the buyer to agree to the recurring payment. Buyers need a PayPal account in order to sign up for a recurring payment. Express Checkout (and Express Checkout with Recurring Payments) is available pretty much globally, and has no monthly charges. We're currently updating our developer portal, but check https://www.x.com/ after the 29th of August, where you'll find a wealth of information on developer information, documentation, sample code as well as SDK's to aid in integrating PayPal. Hope this was useful.
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