This issue is automatically created based on existing pull request: #39297: Fix offline invoice capture (404)

Description (*)

It's not possible to capture offline payment method invoices via the backend ('Capture' button). Trying it will lead to a 404.

Related Pull Requests

The issue comes from 3e63705#diff-f55a86b611d11bb9a801c4b16ba9ac4b17dab4c325d252b86d5d3a8b8275c291

The class has been changed to be implementing HttpPostActionInterface. Clicking the 'Capture' button will send a GET request. Magento's request validator \Magento\Framework\App\Request\HttpMethodValidator will throw an exception leading to a 404 because it expects a POST request.

Manual testing scenarios (*)

1. create an order with an offline payment method
2. create an invoice for the order (offline)
3. capture the invoice