Update app.py

app.py

@@ -1437,5 +1437,23 @@ async def tiers():
     )
 
 @app.get("/portal")
-def a():
-    return RedirectResponse(url="https://billing.stripe.com/p/login/test_6oUcN5g665rp7nLgaq8bS00", status_code=status.HTTP_302_FOUND)
+@app.post("/portal")
+def a(request: Request):
+    email = None
+
+    if request.method == "POST":
+        try:
+            body = await request.json()
+            email = body.get("email")
+        except:
+            email = None
+
+    base_url = "https://billing.stripe.com/p/login/test_6oUcN5g665rp7nLgaq8bS00"
+
+    if not email:
+        return RedirectResponse(url=base_url, status_code=status.HTTP_302_FOUND)
+
+    return RedirectResponse(
+        url=f"{base_url}?prefilled_email={email}",
+        status_code=status.HTTP_302_FOUND
+    )