Our client is a charity and already a worldpay customer, they are looking to re-platform their website to Wordpress. As they are looking for a very simple integration for fundraising purposes we're not looking to implement WooCommerce (too complex for their needs). Instead we wanted to use a form builder like Formidable Forms or Ninja forms. However none of them seem to have ready made plugins listed that we can use.
Could you recommend an easy solution for integrating Worldpay with Wordpress which is NOT WooCommerce?