add support for Business::OnlinePayment

[garu]

@ivanfreeside asked on RT:

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It would be nice if Business::Stripe worked with the Perl standard for
credit card processors, Business::OnlinePayment. Right now
Business::Stripe is kind-of like havin a database driver that doesn't
work with DBI.

We are of course aware that tokenization and recurring payments are a
new part of the base B:OP API and are definitely willing to work with
you to extend and standardize that base API for your needs. See the
AuthorizeNet, PayflowPro and CardFortress modules for examples of
modules that provide similar features.

This is of course a wishlist "bug". :)

Ivan Kohler
Business::OnlinePayment maintainer