Magento – REST API 404 error: “Request does not match any route error” at Shipping method selection Magento 2

We also had the same issue when we tried the below payload it worked

Endpoint: http://localhost:8888/Magento/index.php/rest/V1/carts/mine/payment-information

{ "paymentMethod": { "method": "paypal_express", "additional_data": { "paypal_express_checkout_token" : "EC-xxxxxxxxxxxx", "paypal_express_checkout_redirect_required" : false, "paypal_express_checkout_payer_id" : "XXXXXXXXXX" } } }

In order to get the payment token we used the paypal set express checkout api directly

Here is more details

https://developer.paypal.com/docs/classic/express-checkout/ht_ec-singleItemPayment-curl-etc/?mark=Do%20Express%20Checkout%20Call#

When the customer approves the payment we will get the payer id in the returned url.

Hope this helps!

Your POST command created a cart with an admin token, I believe. Guest carts are for anonymous users, so you made the wrong GET call.

Use GET V1/carts/{cartId} if you want to create a cart with an admin token, or use POST V1/guest-carts to create a cart for an anonymous user.