I want customer to select payment method in my site, how should I make the integration towards Netaxept?

First implement a separate step in your site for selecting a payment method. Then send the name of the selected payment method to Netaxept in "paymentMethodActionList" parameter along the Register call. Netaxept's payment window is displayed as single-page mode for cards. For other payment methods, customer is directed directly from your site to the selected payment method site for completing the payment.