I will be your gohighlevel API and custom apps expert

OAuth V2 is the modern, secure authorization framework that replaced the old static "API Keys" (V1). It is based on the OAuth 2.0 industry standard, which uses a "handshake" process to grant permissions without sharing your actual login credentials.

For Private Integrations, I typically need Admin access to your Agency or Sub-account settings. However, we can also do a screen-share session, or I can provide the documentation and code for you to paste into your Developer Portal.

GoHighLevel’s V2 API uses OAuth 2.0, which issues an access_token that expires every 24 hours. To keep your app connected, you must implement a "Refresh Token" logic. I set up automated scripts (cron-jobs) that proactively refresh these tokens before they expire so your connection never breaks.

Cost and control. Zapier charges per task, which gets expensive at scale. n8n allows for complex branching logic, better handling of OAuth2 refresh tokens, and can be self-hosted to save you hundreds (or thousands) in monthly automation fees.

Absolutely. I build bi-directional syncs (Upserts) ensuring that when a contact is updated in your external database, it reflects in GHL immediately, including all Custom Fields and Tags.

Yes. With Gohighlevel, these usually happen due to incorrect header formatting or missing permissions during the Private App setup. I audit your scope definitions and fix the authentication handshake to ensure your API calls are accepted every time.

I use the GHL API to create custom providers or iFrame bridges. This allows you to view external data or trigger custom AI actions directly within the GHL UI interface without switching tabs.

Some GHL endpoints (like Conversations) don't return the full data body. I orchestrate calls across multiple API endpoints simultaneously to stitch together the full payload, ensuring you get 100% of the message content and metadata.

Yes. I build Private Marketplace Apps and custom integrations that live inside your GHL dashboard. Whether you need a custom UI in the Conversations tab or a specialized "SaaS-mode" tool that talks to external databases like Supabase, I handle the full OAuth V2 handshake and backend logic.

I configure all essential V2 Scopes, including contacts, locations, workflows, opportunities, and conversations. I ensure you have the exact "Read" and "Write" permissions needed for your app to function without triggering "Unauthorized Scope" errors or over-exposing your agency data.