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1. How do I consume REST web services in MuleSoft?
2. What is and $$ in DataWeave?

How do I consume REST web services in MuleSoft?

To consume the REST API in Studio, you must configure HTTP connectors, add a file write operation, and then run the application. Begin in Studio by adding and configuring an HTTP Listener and an HTTP Request connector. You don't have to use HTTPS or set up an account.

What is and $$ in DataWeave?

The $ symbol can be used for accessing the value of a key-value pair in a map. $$ can be used for getting the key (or index) of the key-value pair. From the online documentation: The index is defined by default as $$ and the value as $.