First, what is Idempotency and why I need it?

Checkout this awesome post from Brandum Leach.

Require this package with composer using the following command:

composer require javidalpe/laravel-idempotency 

Register Idempotency middleware on your http kernel file:

'api' => [
    'throttle:60,1',
    'bindings',
    \Javidalpe\Idempotency\Idempotency::class,
], 

To perform an idempotent request, provide an additional Idempotency-Key: <key> header to the request.

If the header Idempotency-Key is present on the request and the request method is different from GET, PUT and DELETE, the middleware stores the response on the cache. Next time you make a request with same idempotency key, the middleware will return the cached response.

How you create unique keys is up to you, but I suggest using V4 UUIDs or another appropriately random string. It'll always send back the same response for requests made with the same key, and keys can't be reused with different request parameters. Keys expire after 24 hours.

The Laravel Idempotency is open-sourced software licensed under the MIT license