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This guide will walk you through connecting your app to HeyGen using OAuth 2.0. We’ll use curl commands to demonstrate each step, making it easy to test the process. HeyGen uses the Authorization Code Flow with PKCE (Proof Key for Code Exchange) for added security.

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Prerequisites

Before you begin, ensure you have:
  • Your HeyGen Client ID
  • Your Redirect URI (This will be provided by the Partnerships team after you have submitted your Integration Intake form)

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Step 1: Initiate User Authorization

To begin the OAuth process, redirect the user to HeyGen’s authorization URL. Create this URL (Replace the placeholders with your own values): 
https://app.heygen.com/oauth/authorize?client_id=YOUR_CLIENT_ID&state=RANDOM_STATE&redirect_uri=YOUR_REDIRECT_URI&code_challenge=CODE_CHALLENGE&code_challenge_method=S256&response_type=code
  • YOUR_CLIENT_ID: Client ID. (e.g., abc123)
  • RANDOM_STATE: A unique string to maintain state. (e.g., xyz789)
  • YOUR_REDIRECT_URI: Your approved redirect URI, ensure URL-encoded. (e.g., https://example.com/oauth/callback)
  • CODE_CHALLENGE Corresponding code_challenge for a generated code_verifier using the PKCE flow (e.g. E9Melhoa2OwvFrEMTJguCHaoeK1t8URWbuGJSstw-cM). See: RFC 7636 Appendix B.
Note:You can generate a code_verifier and code_challenge using online PKCE tools or standard libraries (e.g., Node.js, Python).

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Step 2: Handle the Authorization Callback

After approval, you’ll be redirected to your Redirect URI with a code parameter. It’ll look like this: 
https://yourapp.com/oauth/callback?code=AUTHORIZATION_CODE&state=RANDOM_STATE
Verify that the state matches the one you sent in Step 1, then extract the AUTHORIZATION_CODE.

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Step 3: Exchange Authorization Code for Access Token

Exchange the authorization code for an access token using this curl command: 
curl -X POST https://api2.heygen.com/v1/oauth/token \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "code=AUTHORIZATION_CODE" \
  -d "client_id=YOUR_CLIENT_ID" \
  -d "grant_type=authorization_code" \
  -d "redirect_uri=YOUR_REDIRECT_URI" \
  -d "code_verifier=YOUR_CODE_VERIFIER"
Save the access_token and refresh_token to use in the next steps.

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Step 4: Use the Access Token

Now you can make requests to HeyGen’s API using the Authorization header with the Bearer scheme. Here’s an example listing your avatar groups: 
curl -X GET https://api.heygen.com/v3/avatars \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN"
The HeyGen API endpoints support both authentication methods:
  • OAuth Access Tokens — Use the Authorization header with the Bearer scheme. Format: Authorization: Bearer YOUR_ACCESS_TOKEN
  • API Keys — Use the X-Api-Key header. Format: X-Api-Key: YOUR_API_KEY

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Step 5: Refresh the Access Token

Access tokens expire. Keep track of token expiration and refresh as needed. When the access token expires, use the refresh token to obtain a new one: 
curl -X POST https://api2.heygen.com/v1/oauth/refresh_token \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "client_id=YOUR_CLIENT_ID" \
  -d "grant_type=refresh_token" \
  -d "refresh_token=REFRESH_TOKEN"

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Get User’s Account Information

After successfully authenticating with HeyGen, you can retrieve account information — including remaining credits and billing details — using the GET /v3/user/me endpoint: 
curl -X GET https://api.heygen.com/v3/user/me \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN"
Replace YOUR_ACCESS_TOKEN with the access token obtained during the OAuth process. The billing_type field indicates which billing object is populated in the response:
Billing TypeFieldDescription
walletwalletPrepaid balance in USD (or credits for Enterprise). Includes optional auto-reload settings.
subscriptionsubscriptionPer-pool credit balances with plan tier and reset dates. Used with OAuth integration apps.
usage_basedusage_basedMetered billing with current spending and optional spending cap.
Only the field matching billing_type will be populated; the others will be null.

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Best Practices and Security Considerations

  • Always use HTTPS for all OAuth-related requests.
  • Store tokens securely and never expose them client-side.
  • Implement token rotation and regularly refresh access tokens. If a request fails, check if the access token has expired.
  • Validate the state parameter to prevent CSRF attacks.
  • Use short-lived access tokens and long-lived refresh tokens.
  • Implement proper error handling for token expiration and other OAuth-related errors.