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Need Help setting up SMS Gateway API

Hi everyone.

Im totally new to APIs and i really need help. ive watched a few videos but none of them really explain how a newbie would go about connecting to an API especially APIs that require authentication. Most other vidoes and turials cover more complex auth authentication

I need to connect to an SMS/Whatsapp API. Documentation below
endpoint below
Base URL

Full list is below


I have the API Keys

I need help to authenticate and initialize the cal.

Help needed.