This commit implements the refund API for Viabill.
The Viabill refund api takes amount, currency and order number along with a signature as params and refunds the amount for the order.
This is called from the void function in order payments from solidus backend.
This commit implements the refund API for Viabill. The Viabill refund api takes amount, currency and order number along with a signature as params and refunds the amount for the order. This is called from the void function in order payments from solidus backend.