Redis callbacks are added and demonstrated using webhook container

[vhiwase]

Please find the postman collection for understanding features.

Try running postman APIs (named POST async) without "webhook_endpoint" payload key and take a look at the logs for understanding how Redis callback URLs are working in the background webhook container created from the webhook docker image which was built from the folder named "webhook".

Define any webhook endpoint and try running postman APIs (named POST async) with "webhook_endpoint" payload key for getting the instant results of asynchronous calling on the webhook endpoint.

Add this new feature if you find it helpful.