# LeadTruffle developer documentation > Connect contacts, lead inquiries, conversations, webhooks, and website widgets. ## Complete documentation - [Full documentation](https://api-docs.leadtruffle.com/llms-full.txt): All guides and the complete bundled API contract. - [OpenAPI schema](https://api-docs.leadtruffle.com/openapi.json): Machine-readable OpenAPI 3.0.3 schema. - [API reference](https://api-docs.leadtruffle.com/reference/): Interactive endpoint reference. ## Guides - [Make your first request](https://api-docs.leadtruffle.com/guides/quickstart/index.md): From API key to your first lead inquiry in a few steps. - [Key concepts](https://api-docs.leadtruffle.com/guides/concepts/index.md): Understand contacts, lead inquiries, and API versions. - [Receive lead events](https://api-docs.leadtruffle.com/guides/webhooks/index.md): Connect your application to the moments that matter. - [Verify webhook signatures](https://api-docs.leadtruffle.com/guides/webhook-signatures/index.md): Authenticate incoming events with your shared secret. - [Website widgets](https://api-docs.leadtruffle.com/guides/widgets/index.md): Add and control LeadTruffle widgets on your website. - [Errors and pagination](https://api-docs.leadtruffle.com/guides/troubleshooting/index.md): Handle errors, rate limits, and paginated responses. - [Docs for AI agents](https://api-docs.leadtruffle.com/guides/ai-agents/index.md): Give your agent the complete documentation in one URL.