Costello is pioneering the way organizations build and execute sales playbooks. The platform helps sales reps prepare for calls, ask timely questions, tell relevant stories, and sync insights back to the CRM while showing managers and reps ...
API styles
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Webhooks
Webhooks management API
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Sandbox environment
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Authentication
OAuth playground
Identity protocols
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SSO / Social login
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Postman / Insomnia collections
OpenAPI/Swagger specs
Free developer account
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App listing requirements
Pagination style
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Developer docs
API Reference
CLI
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Query Language
Community
Integrations
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Integrations page
GraphQL playground
API Explorer
API pricing
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API limits
API changelog
Status page
Open-source
Tutorials
Samples & examples
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Base endpoint
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GraphQL endpoint
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IDE Extensions
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Estimated developers
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Estimated customers
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