custom webapi routing

[martin_alley]

Hi

I'm writing a webservice as part of a hosted payment page solution for magento2

I need the web service to be called as part of the checkout process, after placeOrder.

I'm having problems getting control of the routing.

My initial url was within cart  (rest/default/V1/carts/mine/myservice) , but that led to problems with the forced parameter card_id, and the fact the cart is cleared by placeOrder.

So I think I need the url to be in my own space, like rest/default/V1/hostedservice/myservice

I can't get this url to have a recognised route.

I've configured webapi.xml, the interface that implements the method to be called, and the corresponding class and method.

I'm unclear whether routes.xml should play a role in the solution...

I read at https://devdocs.magento.com/guides/v2.3/extension-dev-guide/routing.html that the url should have the format

<store-url>/<store-code>/<front-name>/<controller-name>/<action-name>

This pattern doesn't seem to match the url pattern generated client side by module-checkout/view/frontend/web/js/model/url-builder.js

Although my new url does not mention carts, somehow the stack ends up at
/var/www/html/magento/generated/code/Magento/Quote/Model/Webapi/ParamOverriderCartId/Proxy.php
which causes a 404

I'm about to start debugging /var/www/html/magento/vendor/magento/module-webapi/Controller/Rest.php

Hopefully someone can save me from that pain.

Thanks
Martin

[martin_alley]

The problem was I had left this configuration in webapi.xml...

        <data>
            <parameter name="cartId" force="true">%cart_id%</parameter>
        </data>