Use paypal express checkout as a paymethod creating orders in the backend

Question

I need to enable the paypal express checkout on the backend.

I thought it would be easy, just overriding the module-paypal setting the variable canUseInternal to true, for be exact:

I override this file: /vendor/magento/module-paypal/Model/Express.php

changing the line, setting to true:

protected $_canUseInternal = true;

Now at payment section it displays the PayPal Express Checkout to be elegible, but if I proceed to submit the order it shows that error:

PayPal gateway has rejected request. Invalid token (#10410: Invalid token).

I think it's trying to pay the order on Paypal, but of course there is nothing related of paypal neither credentials.

What can I do? I need to change some functionality, that if it's creating an order through admin, it only places the order, but no idea.

Answer 1

The "provision" solution I made, is creating a new paymethod that only works as an internalMethod and naming it "paypal Express Checkout"

Following this example: https://github.com/magento/magento2-samples/tree/master/sample-module-payment-gateway

The problem is can't have both the same internal code, but for now I can move on with that.