portal.payment.acquirer stores payment processor
options (formally called payment acquirers). Each
acquirer is just a name and an HTML form template,
used to render an HTML snippet that can be included
in views where a payment option should be displayed.
The aquirer model has a generic method for rendering
a complete block of HTML to be included in form views
directly (with matching CSS): render_payment_block().
This method takes a few parameters to figure out
the name/reference, amount, currency, etc. to pay.
bzr revid: odo@openerp.com-20121024131554-j01ucniecjmoz3jq
Olivier Dony