Function for REST API

Hi Guys,

I would appreciate if anyone can guide me a little bit on how do I create Function in Zoho Creator to be able to POST API to 3rd party. I know this cURL works, but I just not sure how to build function around it - any help and guidance would be much appreciated

I am OK with someone helping me out for a fee as well

Here is an example with cURL:

curl https://api.signable.co.uk/v1/envelopes
-u d41d8cd98f00b204e9800998ecf8427e:x
-X POST
-d "envelope_title=My envelope"
-d "user_id=1234"
-d 'envelope_documents=[{"document_title": "Test Document Title","document_template_fingerprint": "fd2906a685817cbeea48b5bb54169f50","document_merge_fields":[{"field_id": 20000,"field_value": "Test Merge"}]}]'
-d 'envelope_parties=[{"party_name": "John Smith","party_email": " john@smith.com ","party_id":10000,"party_message":"Please sign this!"}]'