diff --git a/flutter/lib/services/auth_notifier.dart b/flutter/lib/services/auth_notifier.dart
index 48be1d5..315fc53 100644
--- a/flutter/lib/services/auth_notifier.dart
+++ b/flutter/lib/services/auth_notifier.dart
@@ -34,9 +34,6 @@ class Auth extends _$Auth {
       } else {
         await Posthog().reset();
       }
-      await Posthog().capture(eventName: "user auth change", properties: {
-        "auth_change_event": authState.event.name,
-      });
     });
 
     ref.onDispose(() {
diff --git a/supabase/functions/_shared/posthog.ts b/supabase/functions/_shared/posthog.ts
new file mode 100644
index 0000000..18a4860
--- /dev/null
+++ b/supabase/functions/_shared/posthog.ts
@@ -0,0 +1,6 @@
+import { PostHog } from "npm:posthog-node@3.2.0";
+
+export const posthog = new PostHog(Deno.env.get("POSTHOG_CLIENT_KEY") || "", {
+  flushAt: 1,
+  flushInterval: 0,
+});
diff --git a/supabase/functions/get_stripe_url/index.ts b/supabase/functions/get_stripe_url/index.ts
index 0a08e2d..6f9acc6 100644
--- a/supabase/functions/get_stripe_url/index.ts
+++ b/supabase/functions/get_stripe_url/index.ts
@@ -1,6 +1,7 @@
 import { clientRequestHandler, corsHeaders } from "../_shared/request.ts";
 import { supabase } from "../_shared/supabase.ts";
 import { stripe } from "../_shared/stripe.ts";
+import { posthog } from "../_shared/posthog.ts";
 
 clientRequestHandler(async (req, user) => {
   const { price, return_url } = await req.json();
@@ -30,13 +31,14 @@ clientRequestHandler(async (req, user) => {
 
   // get price based on product
   let redirect_url: string | undefined;
+  let event: string;
 
   // check if user paid for product
   const priceObj = price ? await stripe.prices.retrieve(price) : null;
   if (priceObj === null || activeProducts.includes(priceObj.product)) {
     // open billing portal if product/subscription has been purchased
     // or if price is null
-    console.log("open billing portal session");
+    event = "user opens billing portal";
     const session = await stripe.billingPortal.sessions.create({
       customer: stripeCustomerId,
       return_url: return_url || undefined,
@@ -44,7 +46,7 @@ clientRequestHandler(async (req, user) => {
     redirect_url = session?.url;
   } else {
     // open checkout session to purchase product
-    console.log("open checkout session");
+    event = "user starts checkout";
     const session = await stripe.checkout.sessions.create({
       customer: stripeCustomerId,
       mode: (priceObj.type == "recurring") ? "subscription" : "payment",
@@ -58,6 +60,17 @@ clientRequestHandler(async (req, user) => {
     });
     redirect_url = session?.url;
   }
+
+  posthog.capture({
+    distinctId: user.id,
+    event,
+    properties: {
+      $set: {
+        "stripe_customer_id": stripeCustomerId,
+      },
+    },
+  });
+
   return new Response(
     JSON.stringify({ redirect_url }),
     {
diff --git a/supabase/functions/on_user_modify/index.ts b/supabase/functions/on_user_modify/index.ts
new file mode 100644
index 0000000..f65de5d
--- /dev/null
+++ b/supabase/functions/on_user_modify/index.ts
@@ -0,0 +1,21 @@
+import { posthog } from "../_shared/posthog.ts";
+
+Deno.serve(async (req) => {
+  let { record, old_record, type } = await req.json();
+  record = record || old_record;
+
+  // deno-lint-ignore no-explicit-any
+  const properties: Record<string, any> = { type };
+  properties["$set"] = properties["$set"] || {};
+  properties["$set"].email = record.email || undefined;
+  properties["$set"].created_at = record.created_at;
+  properties["$set"].last_sign_in_at = record.last_sign_in_at;
+
+  posthog.capture({
+    distinctId: record.id,
+    event: "user modify auth table",
+    properties: properties,
+  });
+
+  return new Response(null);
+});
diff --git a/supabase/functions/stripe_webhook/index.ts b/supabase/functions/stripe_webhook/index.ts
index 3732eb1..bfd2537 100644
--- a/supabase/functions/stripe_webhook/index.ts
+++ b/supabase/functions/stripe_webhook/index.ts
@@ -2,6 +2,7 @@ import { processWebhookRequest } from "../_shared/stripe.ts";
 import { supabase } from "../_shared/supabase.ts";
 import { stripe } from "../_shared/stripe.ts";
 import Stripe from "stripe";
+import { posthog } from "../_shared/posthog.ts";
 
 Deno.serve(async (req) => {
   let receivedEvent;
@@ -49,9 +50,27 @@ async function onSubscriptionUpdated(
     }
   }
   // updates purchased_products
-  await supabase.from("stripe").update({
+  const { data } = await supabase.from("stripe").update({
     active_products: prods,
-  }).eq("stripe_customer_id", subscription.customer);
+  }).eq("stripe_customer_id", subscription.customer).select();
+  const row = data?.[0];
+
+  // posthog
+  if (row) {
+    const products = subscriptionItems.map((
+      item: { plan: { product: string } },
+    ) => item.plan.product);
+    posthog.capture({
+      distinctId: row.user_id,
+      event: "user completes checkout",
+      properties: {
+        products,
+        $set: {
+          "stripe_customer_id": row.stripe_customer_id,
+        },
+      },
+    });
+  }
 }
 
 async function onCheckoutComplete(session: Stripe.Session) {