- hash_hmac: documentation ( source)
<?php
echo hash_hmac('sha1','?token=ZDcwZWZhMzQ4MzljMWFkNjg0YTkwZTZlMTExZWY2NmI%3D&amount=208.82&action=sale&returnurl=http%3A%2F%2Flocalhost%3A3036%2FuserAccount.asmx%2FtrustCommerceReturnURL&name=Domingo+Hilario&address1=722+Erinbrook+CT&city=York&state=SC&zip=29745&customfield2=RKHL&customfield1=41047948','c0mpTest19');