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I tried to create a custom payment gateway by creating a custom module based on Paypal module, specically Paypal Express Checkout.

I was able to replicate the route for controller actions: Start, Return, Cancel, and PlaceHolder. I tried to create my own controller action (let's say "NotificationHandler") by copy the Start action, rename the class name, and remove everything in execute() and put echo "hello world";. For some reason, I ran into some weird issue where it expects me to have the first letter of the action to be capital letter (..\ {routeID}\ {controllername}\ Notificationhandler). The site will throw error 404 if I put in the lower case (..\ {routeID}\ {controllername}\ notificationhandler).

Here are some follow up questions:

  1. Is there some config file that determine the exact case of the controller action URL?
  2. Why is it that the ReturnAction use the URL ...{routeId}{controllername}\return instead of ...{routeId}{controllername}\returnaction

Thank you,

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    your 2nd question answer is here magento.stackexchange.com/a/124416/36463 – Bilal Usean Sep 14 '16 at 13:13
  • Interesting. Thank you for sharing the post. Any idea regarding the action route require to be upper case on the first letter or else it throws 404? – frostshoxx Sep 14 '16 at 13:16
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    I hope you can declare controller class Notificationhandler.php not notificationhandler.php. if not please change. show your controller may be it is helpful to debug – Bilal Usean Sep 14 '16 at 13:27
  • Yes, it's Notificationhandler.php, the class name is also Notificationhandler. My confusion is that why is it that I have Start.php with class name Start and I was able to access the controller action via ... {route ID} \ {controller name} \start and not getting 404 error (I can also use ... {route ID} \ {controller name}\Start as well). – frostshoxx Sep 14 '16 at 13:30
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    check namespace and class name in Notificationhandler.php. please attach controller code in your question and show your module tree structure. – Bilal Usean Sep 14 '16 at 13:51
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After I upgrade Magento to version 2.1.1, the issue seems to go away. I was able to access the URL for the action in both upper and lowercase for the first letter.

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