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Using the Azure Service Bus Snap Pack, you can automate the mobile recharge process. When an SMS message is received, the mobile recharge application adds it to the queue, and the receiver application processes the message in first-in-first-out order. The benefit of using an ASB queue is, it creates decoupling between sender and receiver, because the messages are stored in a queue, the sender and receiver do both need not need to be both available at the same time.
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