I work with www.targetpay.com as a payment provider. I would like to integrate this for non fixed amounts. I already use it for fixed amounts integrated with a call to a fixed item in targetpay), that's easy, but for non-fixed I have to use their API or shop-plugins. This is new for me. Can anyone give me some direction, how to go (even if this doc is in Dutch).
I hope I can avoid to work with the API and can use a plugin, which I can call in the payment email and payment confirmation page.
This is the API manual.
https://www.targetpay.com/info/ideal-docu
These are the available plugins.
https://www.targetpay.com/info/webwinkel

Thanx to Targetpay, hereby the English API manual.
https://www.targetpay.com/docs/TargetPa … 3.0_en.pdf

What I do for custom payment options not used by the formbuilder is to use the formbuilder for the html form only and then make my own back end scripts to handle the info submitted.

With great support of Targetpay I now indeed create my own backend by creating an email with a payment button which gives arguments to a php file which calls for this e-acceptgiro with the invoice number and amount as arguments. https://www.targetpay.com/info/eacceptgiro