You just closed a massive enterprise client. They demand a highly custom onboarding flow. You spend weeks building a bespoke integration connecting their legacy CRM directly into HighLevel. The code looks flawless. You push the campaign live.
Instantly, everything breaks. Webhooks fail. Data stops syncing. Your client is furious, and your developer is completely panicked. Why? Because you built your entire infrastructure on an old API version that just lost support. You are burning profitable hours trying to rewrite code that should have been future-proofed months ago.
You cannot scale a high-ticket agency on fragile integrations. HighLevel just completely overhauled their API infrastructure by introducing V2 Private Integrations, strict new rate limits, and a brand new versioned documentation hub. Let us get your backend locked down so your custom apps never crash again.
Part 1: Access the New Documentation Hub
Ready to streamline this? Here is exactly how to do it in 60 seconds:
- Delete your old legacy Stoplight bookmarks immediately.
- Navigate to the official new hub at marketplace.gohighlevel.com/docs/.
- Use the new version switcher inside the documentation to view specific endpoints, schemas, and parameters for the exact API version you are building on.
Part 2: Prepare for the V1 to V2 Migration
You need to migrate before your existing setups fail completely.
- Acknowledge that V1 APIs reach end-of-support on December 31, 2025. Your existing connections will still function temporarily, but absolutely no new updates or support will be provided.
- Transition your apps to V2 by checking out the Private Integrations section for enhanced security and advanced functionalities.
- Note that the ability to generate legacy API keys from Agency and Sub-account settings is being removed entirely for accounts not actively using them.
Part 3: Monitor Your Rate Limits
Stop getting throttled because of bad data requests. HighLevel implemented strict OAuth rate limits for V2 to protect system performance.
- Respect the burst limit. You get a maximum of 100 requests per 10 seconds for each Marketplace app per resource.
- Stay strictly under the daily limit. You are capped at 200,000 requests per day.
- Monitor your usage dynamically by checking your API response headers like X-RateLimit-Daily-Remaining and X-RateLimit-Interval-Milliseconds to prevent unexpected outages.
Part 4: Access Developer Support
Do not expect standard HighLevel support to audit your custom code. You need to use the right resources.
- If your code is perfectly structured but an endpoint still fails, submit a bug report directly at developers.gohighlevel.com/support.
- Join the official developer Slack group at developers.gohighlevel.com/join-dev-community to collaborate with other technical operators.
- Check your plan level. Basic API access is included on Starter and Unlimited plans, but Advanced API access requiring Agency API Keys is locked behind the Agency Pro plan.
Mastering your API infrastructure ensures your agency can build advanced, high-ticket solutions without the constant fear of technical debt.
Frequently Asked Questions
How do I access the New Documentation Hub?
Ready to streamline this? Here is exactly how to do it in 60 seconds: Delete your old legacy Stoplight bookmarks immediately. Navigate to the official new hub at marketplace.gohighlevel.com/docs/. Use the new version switcher inside the documentation to view specific endpoints, schemas, and parameters for the exact API version you are building on.
What should I know about prepare for the V1 to V2 Migration?
You need to migrate before your existing setups fail completely. Acknowledge that V1 APIs reach end-of-support on December 31, 2025. Your existing connections will still function temporarily, but absolutely no new updates or support will be provided. Transition your apps to V2 by checking out the Private Integrations section for enhanced security and advanced functionalities. Note that the ability to generate legacy API keys from Agency and Sub-account settings is being removed entirely for accounts not actively using them.
How do I monitor my Rate Limits?
Stop getting throttled because of bad data requests. HighLevel implemented strict OAuth rate limits for V2 to protect system performance. Respect the burst limit. You get a maximum of 100 requests per 10 seconds for each Marketplace app per resource. Stay strictly under the daily limit. You are capped at 200,000 requests per day. Monitor your usage dynamically by checking your API response headers like X-RateLimit-Daily-Remaining and X-RateLimit-Interval-Milliseconds to prevent unexpected outages.
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