Google Contacts, the address book built into Gmail, lets you keep track of all your contacts, see when you last interacted with them, and more.
API styles
REST
Developer docs
API Reference
Webhooks
Webhooks management API
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Sandbox environment
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Authentication
Identity protocols
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SSO / Social login
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OAuth playground
GraphQL playground
API Explorer
Postman / Insomnia collections
OpenAPI/Swagger specs
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GraphQL endpoint
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