Creating a RabbitMQ pipeline using listeners/publishers

In Event Driven Architectures, you often have to create a pipeline of event processing. One of my teams was using Spring AMQP libary and wanted to implement the following basic steps.
1. Read a message from the queue using a RabbitMQ channel.
2. Do some processing and transform the message.
3. Publish the message downstream with the same channel

The sample code given below will help developers in implementing this.

Another scenario is when you have multi-threaded code that is publishing messages to RabbitMQ, then you can use the RabbitMQTemplate with Channel caching. Sample code given below.

Credit Card Processing Fundamentals

For folks who want to learn the fundamentals of credit card processing, the following links would be useful. The intuitive illustrations make it very easy to understand the overall flow.

http://blog.unibulmerchantservices.com/transaction-authorization-process/

http://blog.unibulmerchantservices.com/submission-clearing-and-settlement-of-credit-card-transactions/

http://blog.unibulmerchantservices.com/mastercard-chargeback-stages/