Request sponsors for pluggable tax modules

[neilt]

There is an existing sales tax module for Washington state in the US. This functionality is currently pluggable, but with only this one use-case.

This functionality needs to be generalized and applied to other sales or value added taxes.

Since this will require local expertise to develop we are looking for Sponsors to support this effort.

For the time being, please respond to this issue if you are interested in this functionality.

[neilt]

In looking at the WA state tax module it seems like an important change would be to use an URL that is obtained from settings instead of directly in the code. This would allow mocking the tax provider for testing.