Implement a custom checkout solution via API on woocommerce

Hello! I have an existing woocommerce store, currently using a plugin with my payment processor. they are now discontinuing this plugin but they do have a custom api solution that i need to implement. I have all the details of the integration, just need assistance setting this up!

It looks like a fairly straight forward integration.

I need this done kind of soon, ideally in the next 1-2 weeks as we are currently having issues with our plugin so the sooner the better!

Can give more specific details upon request.