FlowRelay FlowRelay
View FlowRelay for Shopify Flow

Make setup guide

Connect Make to Shopify Flow through FlowRelay.

Use Make’s HTTP v4 Make a request module to send one authenticated JSON event to a FlowRelay endpoint. FlowRelay checks the request, maps the event, and hands the External event trigger to Shopify Flow. The receipt records whether that handoff happened.

Set up your first endpoint Review authentication

Make the first test harmless.

Prove the transport and handoff before any live schedule, production trigger, or business-changing Shopify Flow action depends on it.

FlowRelay

Install FlowRelay, create one test endpoint, and keep its URL and generated authentication value private.

Shopify Flow

Create a workflow with FlowRelay’s External event trigger and a Log output action. Log only the synthetic event type or summary.

Make

A Make scenario you can edit, with Run once available and no live schedule required for the first test.

Configure FlowRelay and Shopify Flow once.

Use the same endpoint mapping for the first synthetic send. Later, replace the sample values with fields from the real Make workflow.

Endpoint name
Make test to Shopify Flow
Source label
Make
Trigger variant
Generic
Default event type
make.synthetic.test
Mapped paths
event.type, event.id, event.occurred_at, event.summary
Required paths
event.id and event.type
Authentication
Static header for this guide; prefer HMAC when the sender can sign exact request bytes

In Shopify Flow

  1. Create a workflow and choose FlowRelay from the installed app triggers.
  2. Select External event, which matches the Generic endpoint variant.
  3. Add a Log output action with a synthetic field such as Event type or Summary.
  4. Save and enable the workflow before sending the test event.

Review the FlowRelay trigger setup

Configure Make to send the request.

Use Make’s API key keychain with header placement so the FlowRelay static secret is stored as a reusable credential instead of typed into the module’s custom headers.

  1. 01

    Add HTTP v4: Make a request

    Place it after a controlled source module. Keep the scenario schedule off while you prove the first event.

  2. 02

    Create an API key credential

    Choose API key authentication. Put the generated FlowRelay static secret in Key, choose header placement, and use the endpoint’s exact configured header name as the API key parameter name.

  3. 03

    Set POST and JSON

    Paste the private FlowRelay endpoint URL, choose POST, set Body content type to application/JSON, and use a Data structure or JSON string for the synthetic body below.

  4. 04

    Stop on an HTTP failure

    In Advanced settings, set Return error if HTTP request fails to Yes so a 4xx or 5xx response does not look like a completed scenario step.

  5. 05

    Run the module once

    Send the synthetic event, then verify the Make execution, FlowRelay receipt, and Shopify Flow run as three separate facts.

Use synthetic JSON for the first send.

The values below contain no customer, order, token, endpoint, or merchant data. Replace the timestamp with the current test time if that helps you find the run.

Synthetic request body 
{
  "event": {
    "type": "make.synthetic.test",
    "id": "make-test-001",
    "occurred_at": "2026-07-29T15:00:00Z",
    "summary": "Synthetic Make to Shopify Flow test"
  }
}
Make request configuration
FieldValue
ModuleHTTP v4 → Make a request
Authentication typeAPI key
API key placementIn the header
URL and methodPrivate FlowRelay endpoint URL; POST
Bodyapplication/JSON; Data structure or JSON string
Failure behaviorReturn error if HTTP request fails → Yes

Verify three different facts.

A successful sender request, a FlowRelay handoff, and a completed Shopify Flow workflow are not the same fact.

  1. 1Make

    The test execution reached the HTTP step and received a 2xx response.

  2. 2FlowRelay receipt

    Authentication, required fields, mapping, Flow readiness, and handoff show the expected state.

  3. 3Shopify Flow

    A separate Recent runs entry shows that the External event trigger started the workflow.

  4. 4Only then

    Replace synthetic values, review side effects, and enable the live schedule or trigger.

Start with the first fact that failed.

Do not change all three systems at once. The earliest missing record identifies where to look next.

The module never runs
The route or source module did not reach the HTTP module. Inspect the Make execution before changing FlowRelay.
The module returns 401 or 403
Check the keychain’s header parameter name and key against the endpoint’s current static-header credential.
The module returns 400
Check that the body content type is application/JSON and that the generated request body is valid JSON.
Make receives 202 but there is no Flow run
Open the FlowRelay receipt. A missing event.id or event.type appears there as a mapping failure. Fix a Failed or No workflow receipt first; after Delivered, continue in Shopify Flow.

Sources checked for this guide.

Platform field names and availability were checked against official documentation on July 29, 2026. FlowRelay behavior was checked against the shipped product and current public docs.

Prove one Make event before enabling live traffic.

Use a private credential, a synthetic payload, a harmless Flow action, and the receipt-backed handoff check together.

Set up your first endpoint Install FlowRelay