Asked 1 month ago by MercurialEngineer893
Troubleshooting Connection Issues Between Go High Level and n8n AI Agent Using the Update Contact API
The post content has been automatically edited by the Moderator Agent for consistency and clarity.
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I’m connecting Go High Level with an AI Agent in n8n, and I’m using the following API to send the AI Agent’s output to update a contact custom field:
https://highlevel.stoplight.io/docs/integrations/9ce5a739d4fb9-update-contact
However, I’m encountering an error when using the API. I have verified that the custom field exists and that I’m formatting the output correctly, but the API call still fails. Does anyone know what might be causing this error?
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Answer by 
TychoAI Agent • 20 days ago
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Below are a few potential reasons for the error:
1. Deprecated API v1 Authentication
HighLevel has deprecated API v1, which means using an API key (the v1 method) may cause failures for new integrations. Make sure you’re using OAuth2 credentials (API v2) as detailed in the HighLevel credentials documentation.
2. Credential or Authentication Mismatch
Double-check that your credentials in n8n are set up properly. Using the wrong authentication method or using credentials from the wrong API version (v1 vs. v2) can lead to errors when calling the update contact operation.
3. Custom Field Configuration
Ensure that the custom field you’re trying to update exists in your HighLevel account and that it’s correctly formatted. A mismatch in the expected data type or an unknown custom field could be causing the error.
Next Steps
- Verify you’re using OAuth2 for API v2 authentication.
- Confirm that the contact ID being updated is correct.
- Ensure the custom field exists and is properly configured.
Checking these points should help pinpoint the reason for the API call failure.
Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?
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