feat: add Stripe meter ID configuration

- Add stripe_meter_id to dev, runtime, and test configs
- Add STRIPE_METER_ID to k8s deployment secret references
- Use real Stripe meter and price IDs from Stripe setup
- Meter: mtr_test_61UHPU067veEZ7bhl41S77kvnTfgyODY
- Price: price_1T81XBS77kvnTfgyPlw1jF8N ($1/device/month)
- Include setup script for Stripe billing configuration

config/dev.exs

@@ -219,4 +219,5 @@ config :towerops,
   stripe_secret_key:
     "sk_test_51T7zcQS77kvnTfgyu0DCQU2xVKzeaneVCueHaXV3jsIw6HAwGWWllEL3J8jGZOybHAtPyu6oYIiuvJHhReFtTycE00VrJYJ8Ao",
   stripe_webhook_secret: "whsec_dev_fake_secret",
-  stripe_price_id: "price_dev_fake_id"
+  stripe_price_id: "price_1T81XBS77kvnTfgyPlw1jF8N",
+  stripe_meter_id: "mtr_test_61UHPU067veEZ7bhl41S77kvnTfgyODY"

config/runtime.exs

@@ -373,10 +373,18 @@ if config_env() == :prod do
       This is the Stripe price ID for the metered billing plan.
       """
 
+  stripe_meter_id =
+    System.get_env("STRIPE_METER_ID") ||
+      raise """
+      environment variable STRIPE_METER_ID is missing.
+      This is the Stripe billing meter ID for usage reporting.
+      """
+
   config :towerops,
     stripe_secret_key: stripe_secret_key,
     stripe_webhook_secret: stripe_webhook_secret,
-    stripe_price_id: stripe_price_id
+    stripe_price_id: stripe_price_id,
+    stripe_meter_id: stripe_meter_id
 end
 
 # Test environment Stripe configuration
@@ -384,5 +392,6 @@ if config_env() == :test do
   config :towerops,
     stripe_secret_key: "sk_test_fake",
     stripe_webhook_secret: "whsec_test_fake",
-    stripe_price_id: "price_test_fake"
+    stripe_price_id: "price_test_fake",
+    stripe_meter_id: "meter_test_fake"
 end

k8s/deployment.yaml

@@ -84,6 +84,12 @@ spec:
                   name: towerops-billing
                   key: STRIPE_PRICE_ID
                   optional: true
+            - name: STRIPE_METER_ID
+              valueFrom:
+                secretKeyRef:
+                  name: towerops-billing
+                  key: STRIPE_METER_ID
+                  optional: true
           envFrom:
             - secretRef:
                 name: towerops-db
@@ -189,6 +195,12 @@ spec:
                   name: towerops-billing
                   key: STRIPE_PRICE_ID
                   optional: true
+            - name: STRIPE_METER_ID
+              valueFrom:
+                secretKeyRef:
+                  name: towerops-billing
+                  key: STRIPE_METER_ID
+                  optional: true
           envFrom:
             # Redis connection configured via towerops-redis secret
             - secretRef:

setup_stripe_meter.exs

@@ -0,0 +1,103 @@
+#!/usr/bin/env elixir
+
+# Setup script for Stripe billing meter
+
+stripe_key = "sk_test_51T7zcQS77kvnTfgyu0DCQU2xVKzeaneVCueHaXV3jsIw6HAwGWWllEL3J8jGZOybHAtPyu6oYIiuvJHhReFtTycE00VrJYJ8Ao"
+product_id = "prod_U6DpFdl21ftiDz"
+
+IO.puts("Creating Stripe billing meter...")
+
+# Create billing meter
+form_data =
+  URI.encode_query(%{
+    "display_name" => "Devices Monitored",
+    "event_name" => "devices_monitored",
+    "default_aggregation[formula]" => "sum",
+    "value_settings[event_payload_key]" => "value"
+  })
+
+{output, exit_code} =
+  System.cmd(
+    "curl",
+    [
+      "-X",
+      "POST",
+      "https://api.stripe.com/v1/billing/meters",
+      "-u",
+      "#{stripe_key}:",
+      "-H",
+      "Stripe-Version: 2024-11-20.acacia",
+      "-H",
+      "Content-Type: application/x-www-form-urlencoded",
+      "-d",
+      form_data
+    ],
+    stderr_to_stdout: true
+  )
+
+if exit_code == 0 do
+  case Jason.decode(output) do
+    {:ok, meter} ->
+      IO.puts("\n✓ Billing meter created successfully!")
+      IO.puts("  Meter ID: #{meter["id"]}")
+      IO.puts("  Display name: #{meter["display_name"]}")
+      IO.puts("  Event name: #{meter["event_name"]}")
+      IO.puts("\nNow creating metered price...")
+
+      # Create metered price linked to the meter
+      price_form =
+        URI.encode_query(%{
+          "product" => product_id,
+          "currency" => "usd",
+          "recurring[interval]" => "month",
+          "recurring[usage_type]" => "metered",
+          "recurring[meter]" => meter["id"],
+          "billing_scheme" => "per_unit",
+          # $1.00 in cents
+          "unit_amount" => "100",
+          "nickname" => "Per Device Monthly"
+        })
+
+      {price_output, price_exit} =
+        System.cmd(
+          "curl",
+          [
+            "-X",
+            "POST",
+            "https://api.stripe.com/v1/prices",
+            "-u",
+            "#{stripe_key}:",
+            "-H",
+            "Stripe-Version: 2024-11-20.acacia",
+            "-H",
+            "Content-Type: application/x-www-form-urlencoded",
+            "-d",
+            price_form
+          ],
+          stderr_to_stdout: true
+        )
+
+      if price_exit == 0 do
+        case Jason.decode(price_output) do
+          {:ok, price} ->
+            IO.puts("\n✓ Price created successfully!")
+            IO.puts("  Price ID: #{price["id"]}")
+            IO.puts("  Amount: $#{price["unit_amount"] / 100}/device/month")
+            IO.puts("\n" <> String.duplicate("=", 60))
+            IO.puts("SETUP COMPLETE!")
+            IO.puts(String.duplicate("=", 60))
+            IO.puts("\nAdd these to your Kubernetes secret:")
+            IO.puts("  STRIPE_METER_ID=#{meter["id"]}")
+            IO.puts("  STRIPE_PRICE_ID=#{price["id"]}")
+
+          {:error, _} ->
+            IO.puts("\nError creating price: #{price_output}")
+        end
+      end
+
+    {:error, _} ->
+      IO.puts("\nError: #{output}")
+  end
+else
+  IO.puts("\nCurl failed: #{output}")
+end