Allow Merchant to Only Set Universal Links for Venmo (#1503)

* A bug was recently brought to the service channel where if a merchant trys to move from the deprecated BTAppContextSwitcher.sharedInstance.returnURLScheme for Venmo they get an error if only passing a universal link. We should allow merchants to only use universal links without needing to set both that and a returnURLScheme

Author: jaxdesmarais

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Braintree iOS SDK Release Notes
 
+## unreleased
+* BraintreeVenmo
+  * Allow universal links to be set without a return URL scheme (fixes #1505)
+
 ## 6.27.0 (2025-01-23)
 * BraintreePayPal
   * Add `BTContactInformation` request object

Sources/BraintreeVenmo/BTVenmoClient.swift

@@ -83,14 +83,20 @@ import BraintreeCore
         apiClient.sendAnalyticsEvent(BTVenmoAnalytics.tokenizeStarted, isVaultRequest: shouldVault, linkType: linkType)
         let returnURLScheme = BTAppContextSwitcher.sharedInstance._returnURLScheme
 
-        if returnURLScheme.isEmpty {
+        if (universalLink?.absoluteString.isEmpty == true || universalLink?.absoluteString == nil) && returnURLScheme.isEmpty {
             NSLog(
-                "%@ Venmo requires a return URL scheme to be configured via [BTAppContextSwitcher setReturnURLScheme:]",
+                "%@ Venmo requires a return URL scheme or universal link to be configured.",
                 BTLogLevelDescription.string(for: .critical)
             )
-            notifyFailure(with: BTVenmoError.appNotAvailable, completion: completion)
+            notifyFailure(
+                with: BTVenmoError.invalidReturnURL("Venmo requires a return URL scheme or universal link to be configured."),
+                completion: completion
+            )
             return
-        } else if let bundleIdentifier = bundle.bundleIdentifier, !returnURLScheme.hasPrefix(bundleIdentifier) {
+        } else if
+            let bundleIdentifier = bundle.bundleIdentifier,
+                !returnURLScheme.hasPrefix(bundleIdentifier)
+                && (universalLink?.absoluteString.isEmpty == true || universalLink?.absoluteString == nil) {
             NSLog(
                 // swiftlint:disable:next line_length
                 "%@ Venmo requires [BTAppContextSwitcher setReturnURLScheme:] to be configured to begin with your app's bundle ID (%@). Currently, it is set to (%@)",

UnitTests/BraintreeVenmoTests/BTVenmoClient_Tests.swift

@@ -78,6 +78,20 @@ class BTVenmoClient_Tests: XCTestCase {
         let venmoClient = BTVenmoClient(apiClient: mockAPIClient)
         BTAppContextSwitcher.sharedInstance.returnURLScheme = ""
 
+        let expectation = expectation(description: "authorization callback")
+        venmoClient.tokenize(venmoRequest) { venmoAccount, error in
+            guard let error = error as NSError? else { return }
+            XCTAssertEqual(error.domain, BTVenmoError.errorDomain)
+            XCTAssertEqual(error.code, BTVenmoError.invalidReturnURL("").errorCode)
+            expectation.fulfill()
+        }
+
+        waitForExpectations(timeout: 2)
+    }
+
+    func testTokenizeVenmoAccount_whenReturnURLSchemeAndUniversalLinkIsNil_andCallsBackWithError() {
+        let venmoClient = BTVenmoClient(apiClient: mockAPIClient)
+
         let expectation = expectation(description: "authorization callback")
         venmoClient.tokenize(venmoRequest) { venmoAccount, error in
             guard let error = error as NSError? else {return}