From 7eb26e102189026970b4271f92143bcc34073159 Mon Sep 17 00:00:00 2001
From: Fabien <fabcien@gmail.com>
Date: Mon, 9 Feb 2026 19:33:59 +0100
Subject: [PATCH] Generate deeplinks instead of calling Cashtab directly

Cashtab will still be called via a redirection if no app handles the link first. This makes this code compatible with both mobile and desktop with no special case.

Works together with https://github.com/PayButton/paybutton-server/pull/1106.
---
 react/lib/components/Widget/Widget.tsx | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/react/lib/components/Widget/Widget.tsx b/react/lib/components/Widget/Widget.tsx
index a6cdc156..eea5557f 100644
--- a/react/lib/components/Widget/Widget.tsx
+++ b/react/lib/components/Widget/Widget.tsx
@@ -946,9 +946,32 @@ export const Widget: React.FunctionComponent<WidgetProps> = props => {
     }
   }, [totalReceived, currency, goalAmount, price, hasPrice, contributionOffset])
 
+  const convertBip21ToDeeplink = (bip21Url: string): string => {
+    // Parse BIP21 URL: ecash:address?amount=100&opreturnraw=xxx
+    const [addressPart, queryPart] = bip21Url.split('?')
+    const params = new URLSearchParams()
+    params.set('address', addressPart)
+    
+    if (queryPart) {
+      const queryParams = new URLSearchParams(queryPart)
+      // Add all query parameters from the BIP21 string
+      queryParams.forEach((value, key) => {
+        params.set(key, value)
+      })
+    }
+    
+    // Add b=1 to the deeplink URL to indicate that the payment app should move
+    // back to the browser after the payment is complete.
+    params.set('b', '1')
+    
+    // Return absolute URL for the deeplink
+    return `https://paybutton.org/app?${params.toString()}`
+  }
+
   const handleButtonClick = async () => {
     if (thisAddressType === 'XEC') {
-      await openCashtabPayment(url)
+      const deeplinkUrl = convertBip21ToDeeplink(url)
+      await openCashtabPayment(url, deeplinkUrl)
     } else {
       window.location.href = url
     }