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To be able to configure the accepted credit card types I added a new interface
ICreditCardTypeEnumerator. 

getpaid.core will use an adapter providing ICreditCardTypeEnumerator to return the
default credit card lists. PloneGetPaid adds a new adapter that lists the accepted
credit cards based on the portal GetPaid configuration.

Reopening to get a small change and note behavior. Change: can we label the columns
of credit cards accepted and those available? ie at top of each box "Available",
"Accepted". 

I noticed that when checking out, the list is taken, but my checkout went through
even when no card was set. 

Should we set all to accepted by default? At least for the default payment processor? 

oops...nevermind...my order did get rejected on the processing (not sure what I had
done before). Still interested in the labels and the question about making things
default accepted. 

Added default value for accepted credit cards (all types by default), in the schema
and in site setup.

About labels in the selection widget, maybe we should find a more general solution.
This field is using OrderedMultiSelectionWidget, like other fields ("buyable content
types", "donable content types", etc), so it will be necessary to pass some
additional parameters in the schema and then use in the widget's template.

Cool. Defaults look good from a UI perspective. 

Next round includes: Label the list of "available" credit cards and the list of
"accepted" credit cards so users know the different between the two. 

moving to m2 for that. 

changing name to clarify task. 

This doesn't seems very possible without cusomizing the current widget, the other
option would be to add it in the help text.

Added new issue for the usability enhancement: http://code.google.com/p/getpaid/issues/detail?id=191