Recurring payments Prestashop - repost

I have an almost finished webshop, based on Prestashop. My PSP is SveaWebPay, and Euroline settles the payments. The module for SveaWebPay is installed and set up. So far so good. What I need now is to ensure that the payment solution sends and receives the correct XML for recurring payments, since my business is subscription based. The service will operate on a monthly cycle, so apart from making sure that all payments are registered as recurring payments, I would also like to "set" the time frame when payment processing is done every month (between the 10th and 15th every month). This is the objective of this assignment. I have all documentation necessary, readily available in English (and Swedish). SveaWebPay has excellent APIs, documentation, tracking/testing facilities and support. I simply lack the expertise necessary to guarantee that everything is right, which is critical when it comes to payments. Attached you will find SveaWebPay's technical specification, including a section about recurring payments. I value skill and experience higher than low price. It is also desirable that the project can be carried out within 2-3 weeks time from now (April 12, 2012). Geza Csikasz p.s. This is a repost, due to an earlier misunderstanding. d.s.