Smartstaff, administrator
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→Using external verification services in your signup page
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||IRS
||The Internal Revenue Service (IRS) and Internal Revenue Service via Charity Navigator (IRS) lookup contains a list of 501(c)(3) and other charitable organizations.
https://www.irs.gov/charities-non-profits/exempt-organizations-business-master-file-extract-eo-bmf
||Monthly
