Integration of new payment gateway (iDeal) in WPGeodirectory

I am using a wordpress website with the Geodirectory plugin ([login to view URL]) For handling the charge of (recurring) subscriptions to place adds in the directory Geodirectory has an own plugin called wpinvoicing ([login to view URL]) I would like to integrate iDeal (Dutch payment gateway) with the wpinvoicing plugin using either Mollie or Stripe. - For Stripe, there is already an payment gateway (available for you on request) but this doesn't include iDeal ([login to view URL]) - For using Mollie, this payment gateway should be made. Documentation for building this can be found here: [login to view URL] Could you please let me know what it would cost to: - Implement iDeal in Stripe so it can be used with the wpinvoicing plugin or - Build a Mollie payment gateway for using with wpinvoicing plugin With your quotation, please also inform if you would use the Stripe or the Mollie gateway.