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Configure the Resend SDK

Your existing Resend code, pointed at Cowliss. Cowliss serves Resend’s emails API, so the calls you already wrote keep working and every message lands in the same delivery log as the ones your journeys send.

This is for the mail your own code sends. Anything with a rule or a wait behind it belongs in a journey, which is where consent, frequency and waiting live.

Two variables

Section titled “Two variables”
Terminal window
RESEND_BASE_URL=https://api.cowliss.com/resend/app_app-cowliss-com
RESEND_API_KEY=<your Cowliss API key>
import { Resend } from "resend";


const resend = new Resend(); // both read from the environment

An app that is already sending needs no code change, and new Resend(key, { baseUrl }) works the same.

The base URL ends with the app id of the app you are sending for. Read it back with cow apps list or copy it from the app’s page. See Apps and sources.

The key is the org-level API key from Settings → Credentials. It is not scoped to an app: the id in the URL is what says which app a message belongs to.

Where next

Section titled “Where next”
  • Send: one message, a pushed template, and what from may be.
  • Batch: up to 100 messages in one call.
  • Reference: what is served, what is refused, and every error.