You can continue using TPL instead of TWIG with our Template Switcher. However, be aware there are also other changes to be done in order for your payment module to work on OpenCart 3.x.
MHC Web Design
Override Engine * Integrated VQMod * Multilingual SEO * Instant Option Price Calculator * TrustPilot Reviews * Google Rich Snippets * Google Tag Manager * Export/Import Tool * Template Switcher PHP/Twig
Not only tpl files you must convert. You must make some modification of the controller files also. I write PM for you in this case.
Custom OpenCart modules and solutions. You can write PM with additional questions... Extensions you can find here
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