New plug-in for Paymet addon

Hello,

Do anyone of you know how to develop a new plug-in for Payment addon?

We need to specify a new format for sending a payments file to bank.

Have read that it can be developed a new dll, which contains the logic of the new formats, but dont know the dll estructure.

Have you an example of some dll or know where it can be found?

Any help would be appreciated,

Thank you very much!