Send email from Pipedream, or Zapier.

// Environment variable NOTIX_API_KEY is set in Pipedream's settings,
// never typed into the step. steps.trigger.event is the trigger's payload.
export default defineComponent({
  async run({ steps, $ }) {
    const order = steps.trigger.event;

    const response = await fetch("https://app.usenotix.dev/api/v1/emails", {
      method: "POST",
      headers: {
        Authorization: `Bearer ${process.env.NOTIX_API_KEY}`,
        "Content-Type": "application/json",
        // Pipedream may re-run a workflow; the key keeps one email per order.
        "Idempotency-Key": `order-${order.id}-receipt`,
      },
      body: JSON.stringify({
        from: "receipts@acme.com",
        to: order.customer_email,
        templateId: "tpl_receipt_v4",
        variables: { orderId: String(order.id), total: order.total },
      }),
    });

    const body = await response.json();
    if (!response.ok) {
      // { error: { code, message } }; 429 carries Retry-After
      throw new Error(`Notix ${response.status} ${body.error?.code}: ${body.error?.message}`);
    }
    $.export("emailId", body.emailId);
    return body;
  },
});

Method:   POST
URL:      https://app.usenotix.dev/api/v1/emails
Headers:  Authorization: Bearer {{process.env.NOTIX_API_KEY}}
          Content-Type: application/json
          Idempotency-Key: order-{{steps.trigger.event.id}}-receipt
Body (JSON):
{
  "from": "receipts@acme.com",
  "to": "{{steps.trigger.event.customer_email}}",
  "templateId": "tpl_receipt_v4",
  "variables": { "orderId": "{{steps.trigger.event.id}}" }
}

Response: { "emailId": "..." }   Errors: { "error": { "code": "...", "message": "..." } }

Action:   Webhooks by Zapier → Custom Request
Method:   POST
URL:      https://app.usenotix.dev/api/v1/emails
Headers:  Authorization | Bearer <your API key, stored in the Zap>
          Content-Type  | application/json
          Idempotency-Key | order-{{Order ID}}-receipt
Data (raw JSON):
{
  "from": "receipts@acme.com",
  "to": "{{Customer Email}}",
  "templateId": "tpl_receipt_v4",
  "variables": { "orderId": "{{Order ID}}" }
}

There is no Notix app in Zapier's directory; the Custom Request step is
the supported path and uses the same API as everything else on this page.