first version

extensions/flow-send-invoice-email/README.md

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+# Send invoice email (Flow action)
+
+Triggers `POST /api/flow/send-invoice-email` on the embedded app.
+Inputs:
+  - `order_id` (commerce object reference, type `order`, required)
+  - `recipient_email_override` (single line text, optional)
+
+If no invoice exists yet for the order, the endpoint generates one first.

extensions/flow-send-invoice-email/shopify.extension.toml

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+api_version = "2026-01"
+uid = "755ff6f6-8f68-10df-5f23-2244a5eed905c7b67bc4"
+
+[[extensions]]
+name = "Send invoice email"
+type = "flow_action"
+handle = "flow-send-invoice-email"
+description = "Sends the generated PDF invoice via email to the order's customer (or an override address)."
+runtime_url = "https://example.com/api/flow/send-invoice-email"
+
+  [extensions.settings]
+
+    [[extensions.settings.fields]]
+    type = "single_line_text_field"
+    key = "order_id"
+    name = "Order ID"
+    description = "The order's GID (use Liquid: {{order.id}} when configuring the workflow)."
+    required = true
+
+    [[extensions.settings.fields]]
+    type = "single_line_text_field"
+    key = "recipient_email_override"
+    name = "Recipient email (optional)"
+    description = "If set, sends to this address instead of the customer's email on the order."
+    required = false