There are currently several options in case you want to call rest API services:
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Rest API connector (Rest API - Help center): this is the easiest way how to work with rest API services and endpoints. Easy to configure.
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Advanced Rest API connector (Advanced Rest API - Help center): this is an extension of the standard rest API connector but offers additional options on the authentication part. Also very easy to configure with the possibility to use a wide range of authentication methods.
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Node.JS processor (Node.js processor - Help center): You can use await and fetch inside the Node.JS processor so you can program your own handling of rest API calls. Here you need to utilize your JavaScript skills.
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Python processor (Python processor - Help center): similar to Node.JS processor with the difference that you can use Python language.