If the Route is defined in api.php, then there is also an api prefix for the URI; https://127.0.0.1:8000/api/data/stripeKeyStore. This particular URI is not one you have attempted in Postman (according to your request history).
Forget postman for the moment, put this in your browser and see what you got. You should get response, if not then it is your application that is misconfigured.
For instance here is an API endpoint that works in both postman and browsers:
127.0.01 shouldn't be a problem, but it is definitely worth checking.
but i wonder where does this: Your HTTP method is not correct come from? where do you have that code? it is not in laravel out of the box... search for this string in your whole project (including the vendor directory) and post here the related code and where it is.