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