Getting 'Error 403: Forbidden' when trying to integrate a geo-targeting API, any ideas?

Hey everyone, total newbie here. I'm trying to integrate a geo-targeting API for my app, but I keep hitting a '403 Forbidden' error whenever I make a request.

Here's what my console shows:

HTTP/1.1 403 Forbidden
Content-Type: application/json
Content-Length: 45

{
  "error": "Access Denied",
  "message": "Invalid API Key or insufficient permissions."
}

Anyone faced this before with a geo-targeting API or similar service?