Hi,
well yes, but I do have 2 issues - where to take authorization-key if I omit it either get invalid request error or link to “login” page as a response.
like described here: https://community.shopify.com/c/Shopify-APIs-SDKs/Marking-order-transaction-as-paid-with-REST-Admin-API/m-p/514619
it seems that go for the shopify was a big mistake 
and due to their intelligent monetizing scenario, they do block this option by purpose - with no alternative how to handle payments to bank account automatically - they live in a world where credit cards are used only I guess (but maybe I’m wrong - or I hope I’m wrong).
R.