WooCommerce Payment Gateway plugin finishing

Hello We need a freelancer who will finish payment gateway plugin for WooCommerce. Plugin is 70% finished because our programmer went abroad before he could finish it. Plugin is based on form method (post). Customer and order data is sent normally to payment gateway, and transaction is successfull on payment gateway side, but when it should return customer to the shop it just goes back to the payment form/server of p. gateway. You will receive our unfinished plugin, implementation documentation in english and test credit cards. Also, we need few simple suggestions around getting data from order after payment has been completed. Functions are written, but we can't get customer name and surname from order. Really simple questions which sholudn't be a problem for experienced php/wp developer. Please have in mind that we are looking for long term partner, because we frequently need programmer for simple tasks like this.