This commit improves the tokenization process, allowing users
to set the acquirer to save payment data never, always or letting
the customer decide (only implemented in ecommerce for now).
Support for tokenization is improved for Ogone and Authorize.net
This commits also factorizes advanced payment features support
(authorization, tokenization, fees computation) in a generic method
overriden by every provider to specifiy which features are supported.
This process can be used in views to hide/show fields depending on
feature support or in constraint checks.
This allows using a modern e-commerce flow where amounts are first
authorized at checkout then captured when the picking is in fact
shipped instead of immediately capturing the amount.
To access this flow, a new selection value is available on the payment
acquirer: "Authorize the amount and confirm the SO on acquirer
confirmation". If this value is selected, s2s/form transactions should
only require authorization to the acquirer; the user can then
capture/void the payment manually from the Odoo backend transaction
form view by simply using buttons.
Nicolas Martinelli