LettrLabs

How to generate an Open API key and set up inbound webhooks to trigger mail or attribution from your own systems.

Setup Guide: Open API & Webhooks

Technical reference for developers: request format, authentication, response codes, and field shapes for each webhook action type.

Inbound Webhook Reference (Payload & Field Guide)

Adam Rutkowski

Trigger mail sends and upload recipient data directly from your own systems using LettrLabs' API and webhooks.

Open API / Webhooks

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Because you already asked about invitations, this prototype demo can add the follow-up: use the role selector before sending each invite to limit access to the teammate responsibilities.

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