<form> contactId: <input type="text" name="contactId" value="<?php if (isset($_REQUEST['contactId'])) { echo htmlspecialchars($_REQUEST['contactId']); } ?> "><br/> last4: <input type="text" name="last4" value="<?php if (isset($_REQUEST['last4'])) { echo htmlspecialchars($_REQUEST['last4']); } ?> "><br/> <input type="submit"> <input type="hidden" name="go"> </form> <?php include '../infusionsoft.php'; include 'testUtils.php'; if (isset($_REQUEST['go'])) { $out = Infusionsoft_InvoiceService::locateExistingCard($_REQUEST['contactId'], $_REQUEST['last4']); var_dump($out); }