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I am trying to edit the checkout form in Drupal Commerce, to require a user to enter their email address twice. When they submit their form, Drupal should check to see if the emails match, and call form_set_error() if they don't. For now, I am just trying to attach a custom validation function to the form, which I can't get to work. (My module is called checkout_confirm_email. This module is only for our own use, so I didn't put much effort into the name). function checkout_confirm_email_form_alter(&$form, &$form_state, $form_id) { if($form_id == 'commerce_checkout_form_checkout') { $form['#validate'][] = 'checkout_confirm_email_form_validate'; dprint_r($form['#validate']); dsm("I printed"); } } function checkout_confirm_email_form_validate($form, &$form_state) { dsm("Never prints..."); } The dprint_r statment outputs Array ([0] => checkout_confirm_email_form_validate) . So the function is part of the form array, but the dsm statement in the validation function never prints. I've actually been stuck for a while. I've looked up examples, and I can't see what I'm doing wrong. Anyone?

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