Composio connects AI agents to Google Merchant Center so they can work with Merchant Center accounts, product data, and inventory through the Merchant API.
Use your own Google OAuth app to control its credentials and the permissions your workflow requests.
Use a Google account with access to Merchant Center. For first-time developer registration, Google requires an existing production Merchant Center account with a verified homepage and an authorized admin.
Part 1. Set up your Google OAuth app
Step 1. Select a project and enable the API
Open Google Cloud Console and select the project that will own your OAuth client.
In APIs & Services → Library, find the service for your workflow. Enable Merchant API (merchantapi.googleapis.com) in your Google Cloud project.
Step 2. Configure branding and audience
Open Google Auth Platform → Branding. Enter an app name, support email, and developer contact details.
Under Audience, choose the audience that matches your users. For an external app in Testing, add the accounts you will use under Test users.
Step 3. Choose permissions for your workflow
Open Google Auth Platform → Data Access and select Add or remove scopes. Add the scopes your workflow needs and save.
Merchant API account listing uses the content scope. This scope also covers write operations allowed by the user’s Merchant Center role. Review it before authorizing.
The example requests https://www.googleapis.com/auth/content. Choose scopes for the actions you plan to use.
Merchant API developer registration · Merchant API account-listing scope
Step 4. Create the OAuth client
Open Google Auth Platform → Clients, select Create client, and choose Web application.
Under Authorized redirect URIs, add the production callback used by the Composio auth form.
https://backend.composio.dev/api/v1/auth-apps/add
Select Create. Save the client ID and copy or download the client secret before you close the dialog. Google shows the full secret once. Store it privately.
Step 5. Complete the provider prerequisite
Complete Google’s one-time developer registration for the Cloud project that owns your OAuth client. An authorized Merchant Center admin links the project to the Merchant Center account. Use the registered project for your Composio connection.
Part 2. Connect Google Merchant Center in Composio
Step 1. Create an auth config
In the Composio dashboard, open Auth Configs → Create and select Google Merchant Center. Enter a config name and choose Next.
Select OAuth 2.0 if prompted. Choose Your Own Credentials when that option appears. Enter your client ID and client secret, verify the redirect URI, and select the scopes your workflow requires. Then select Create Auth Config.
Step 2. Authorize the account
Open the auth config and select Connect Account. Sign in with a Google account that meets the prerequisites above and review the permissions before you continue.
If the connection check reports that the Google Cloud project is unregistered, complete developer registration for that project and try again.
Step 3. Verify the connection
Return to the auth config and check that the connected account shows Active in Accounts.
Before using the app in production
Review Google’s verification requirements for the audience and scopes you chose. External apps in Testing can receive refresh tokens that expire after seven days. Check the requirements for your app before inviting production users.