Most people building automations in n8n or GoHighLevel hit a wall the moment they need to connect to an external app: Google Sheets, WhatsApp, Slack, Airtable, Retell AI...
The automation just... stops working.
The reason? They don't understand APIs and webhooks.
Without a working knowledge of these two things, your workflows can't communicate with the outside world.
No create. No read. No update. No delete.
This is foundational knowledge. If you're building AI automation workflows without it, you're building on sand.
What is an API (Application Programming Interface)?
It is a software interface provided by an application that allows it to communicate with other applications.
For example:
GoHighLevel API allows GoHighLevel to communicate with other applications (like Retell AI, n8n, etc)
Similarly,
Retell AI API allows Retell AI to communicate with other applications (like GoHighLevel, n8n etc).
You need to use APIs to ensure your workflow automation reliably communicates with external applications such as Google Analytics, Google Sheets, WhatsApp, Retell AI, and GHL.
Note: If an application does not provide an API, external applications cannot reliably read or update its data programmatically.