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Here is a screen shot of Postman showing some of the POST json text:
and the result itself:
In the POST text note how the GELLO section is now written with with new line characters at the start of each line.
If we don’t need want to return all see the variables , delete ( say for debugging - although you would do this more in the editor), add ‘V,1’ from to line 2, to make it:
"Debug": "V,1",
You can also return the result as a tuple instead of a single typed value (which in this case is simply a string).