Opencart Custom Checkout Modification

Job ID: 38672487

Budget: $10 – $30 USD

need to develop a code in Opencart, if checkout page fulfilled with data which come by API then redirect to payment gateway without confirmation of the user,
to be clear, Im using mobile application for opencart, customer will inter all his information and then he will chose a payment method, the application is not supporting a native payment gateway so customer will be redirected to Opencart checkout page all his information will be there but he should click submit to be redirected to payment gateway.
please note : I don't prefer auto click checkout button
Related categories: PHP JavaScript MySQL HTML Open Cart