feat: implement payment flow for event joining including success/failure pages and navigation

01_Requirements/REQ0189/index.md

@@ -6,10 +6,39 @@ tags: mobile, payment
 
 frontend page to handle party-user pay join event
 
-edit page T.B.A.
+## User flow
+
+```mermaid
+graph TD
+  a["user trigger paid request"]
+  b["redirect user to payment gateway"]
+  c["payment success, redirect user to payment success page"]
+  d["payment failed, show user"]
+  e["redirect user back to event_detail page"]
+
+
+  a --> b --payment ok --> c --> e
+  b --payment failed --> d
+  d --> e
+```
+
+## Test
+
+- assume user already login
+
+| steps | description                                         |
+| ----- | --------------------------------------------------- |
+| 1     | user enter event detail page                        |
+| 2     | user press join button                              |
+| 3     | app redirect to payment gateway page                |
+| 4     | user choose pay                                     |
+| 5     | payment success, redirect back to event_detail page |
+| end   | test done                                           |
 
 ## TODO
 
+T.B.A.
+
 ## sources
 
 T.B.A.