Callout means calling an external endpoint from Salesforce mostly through APEX when you have to integrate your org with any others systems. Basically, there is nothing very complex on implementing this, but what happens when you need to change something, when the external system resource is not ready or not yet developed, when you need to validate your feature without the availability of external resources and finally how can you test and track everything ? In this article, you will explore the new features of the framework helping you to achieve all of these.
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Salesforce Secure Development Library 