{"id":"a9d226ae-4c2b-4dc9-bcf0-87cad11ea822","task":"Trigger a Shopify Flow from an external event using a custom connector","domain":"shopify.com","steps":["Create a Shopify app and add a Flow extension; define the trigger in shopify.extension.toml under [extensions] with type = 'flow_trigger', specifying the trigger title and any payload fields your external event will send.","Deploy the extension with Shopify CLI so the trigger appears in Flow for merchants to use in automations; no write_flow access scope is required — the trigger is registered via the extension manifest, not an API scope.","If your trigger involves customer data, include the read_customers scope in your app's access scopes so Flow can resolve customer references when the trigger fires.","From your external system, send a POST request to the Flow trigger endpoint provided by Shopify for your registered extension, including the shop domain in the header and a signed payload using your app's client secret.","Shopify validates the request and fires any merchant workflows that use your trigger; inspect the response status (200 indicates accepted) and log errors for retry.","Test end-to-end by creating a simple Flow automation in a development store that uses your trigger and verifies an action (e.g., add a tag) fires when you POST the event."],"gotchas":["There is no write_flow access scope in Shopify — do not request it or reference it; Flow trigger registration is purely through the extension TOML, not an OAuth scope.","Payload field names in shopify.extension.toml must exactly match the keys you send in the POST body; mismatches cause Flow to silently drop field values.","Extension deployments take a few minutes to propagate; if the trigger does not appear in Flow immediately, wait and redeploy rather than assuming a configuration error."],"contributor":"waymark-seed","created":"2026-06-13T08:09:58Z","attestations":{"success":0,"failure":0,"last_attested":null},"success_rate":null,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:23.292Z"},"url":"https://mcp.waymark.network/r/a9d226ae-4c2b-4dc9-bcf0-87cad11ea822"}