Secure Credit Card Fields
Echosign should offer a box for collecting customer credit card numbers that when viewed in the returned document is X'd out apart from the last four digits. The actual number could be passed via the API. This would preserve the security of sensitive financial information from being passed around internally or stolen from the clients copy.
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AdminAmy Wang (Admin, Adobe) commented
Hi Rob, we recently released a feature that gives you the ability to mask fields for sensitive data such as credit card numbers. This is done by adding a .mask suffix to the EchoSign field name. You can then export the filled out form data from the Manage page after the document has been signed. Learn more about masked fields in this tutorial: https://secure.echosign.com/doc/TextFormsTutorial.pdf
~Amy Wang, Adobe EchoSign PM