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i will provide source mapping location and payment api, after the initial framework and web template that i need from you. Please build a payment site that allows tax payers to gov sites and post or call what ever data that is avaliable any open source data of the what the below examples may be using.
this is pre planning and will finsh with a bigger project to come.
http://www.irs.gov/uac/Pay-Taxes-by-Credit-or-Debit-Card (see payment sites that are options>>> not the actual url given)