If they support coupons, I don't see why they can't support taxes. Taxes are just the opposite of coupons and should be relatively easy for them to implement.
One of my developer pet peeves is when 3rd parties (especially ones that think they're helping you) tell you that something they want should be "easy" to do.
Changing the interface to a payment processing gateway, including all of the support documentation and code/security audits, is not easy.
If everyone that wanted something from you prefaced their request with "I don't see why they can't"... you'd probably get annoyed, too.
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If they support coupons, I don't see why they can't support taxes. Taxes are just the opposite of coupons and should be relatively easy for them to implement.
One of my developer pet peeves is when 3rd parties (especially ones that think they're helping you) tell you that something they want should be "easy" to do.
Changing the interface to a payment processing gateway, including all of the support documentation and code/security audits, is not easy.
If everyone that wanted something from you prefaced their request with "I don't see why they can't"... you'd probably get annoyed, too.
'Taxes' and 'easy' are two words that never go together.