Reply To: easyStartPrice is not defined

The first line of your $form should be

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$form = '<form name="gateway_form" action="http://link-to-custom-gateway.com" method="post">';

the name you enter there (now gateway_form) must be in the registration’s array form_name value. The amount_name must be the name of the price field in your form. In your case “amount”.
Regards