See if you can grok this code from the recurring fee module I'm working on... it uses hook_form_alter() to remove improper payment methods from the form. In your case, you'd need to change the logic that determines what to remove:
<?php
function uc_recurring_form_alter($form_id, &$form) {
// We may need to alter the checkout form to remove invalid payment methods.
if ($form_id == 'uc_cart_checkout_form' && isset($form['panes']['payment'])) {
$order->products = uc_cart_get_contents();
// Make no changes if no recurring fees are found.
if (uc_recurring_find_fees($order) == array()) {
return;
}
// Remove invalid payment methods from the payment pane.
$valid = variable_get('uc_recurring_payment_methods', array());
foreach (array_keys($form['panes']['payment']['payment_method']['#options']) as $key) {
if (!isset($valid[$key]) || $valid[$key] === 0) {
unset($form['panes']['payment']['payment_method']['#options'][$key]);
}
}
$count = count($form['panes']['payment']['payment_method']['#options']);
if ($count == 0) {
// Display an error message if no payment methods remain.
drupal_set_message(t('There are no payment methods configured for orders with recurring fees!'), 'error');
drupal_set_message(t('Please contact an administrator to solve the issue.'), 'error');
}
elseif ($count == 1) {
// If only one payment method remains, make it the default.
$form['panes']['payment']['payment_method']['#default_value'] = array_pop(array_keys($form['panes']['payment']['payment_method']['#options']));
}
}
}
?>
Joined: 08/07/2007