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Custom Connector : x-www-form-urlencoded body : invalid JSON

I would be very grateful of anyone's help. I need to create a custom connector which will call a REST API from an on premise application across our data gateway.

I have a GET request working nicely so the gateway connection is working correctly but I am running into problems when using a POST request because of the required format of the BODY payload. I have the call working correctly in POSTMAN but importing the definition or creating manually in the custom connector is not working.

I have created a policy which updates the http header to the required x-www-form-urlencoded content-type but this doesn't change the validation on the body content entry.

My question is, in postman you can create a nice key (input_data) value ( {myJSONStructure}) pair which generates the body structure 'input_data={myJSONStructure}' which is what this API expects.

In the custom connector it wont accept input_data={myJSONStructure} as it its not valid JSON, how can I enter the required JSON structure into the custom connector so the body payload is generated input_data={myJSONStructure}

any help gratefully received.

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