Payment gateway for GNU TALER

[rasos]

GNU Taler is an open-source, anonymous yet taxable electronic payment system. It provides a safe and secure way for customers to pay without exposing their personal data, while ensuring merchants remain fully identifiable for tax purposes.

A payment gateway would include the following steps:

Invoice integration: In the existing Payment Request system in ERPNext integrate the Taler payment link

Payment Processing: Handle taler://pay/ URIs to initiate payments and onfirm transactions with the Taler backend and update the ERPNext Sales Invoice status upon successful payment.

Backend Configuration: Provide a settings interface for ERPnext merchants to input their Taler merchant backend credentials, including the E-commerce access token which is available in the GNU Taler merchant backend since GNU Taler 1.1.

We might also think about a refund management, so that administrators can send refunds by generating a refund URI from the Taler backend and forward it to the customer via email for confirmation.

GNU Taler integration would align with the open-source ethos of the Frappe/ERPNext ecosystem and provide a unique payment alternative, especially for users in regions where Taler is operational, such as Switzerland.

The Mollie integration might be a template for some parts of the GNU Taler integration #182