v2.0.0
- Added support for retrieving payment methods (including issuers) for an order.
- Added support for refunding payments.
- Added support for initial/recurring payment requests.
- Added support for subject merchants and sending fees in create order.
- Added payment methods Maestro, Bancontact & Sofort.
- Changed account_iban/bic/name to consumer_iban/bic/name.
- Removed Docdata::Order::Ideal.
- Dropped support for Ruby 2.3.