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 Tag Manager * Google Rich Snippets * Export/Import Tool * Template Switcher PHP/Twig
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