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