Fix Apple Pay test

Author: davidme-stripe

Example/PaymentSheet Example/PaymentSheetUITest/EmbeddedUITest.swift

@@ -667,7 +667,10 @@ class EmbeddedUITests: PaymentSheetUITestCase {
         app.buttons["Present embedded payment element"].waitForExistenceAndTap()
 
         app.buttons["Apple Pay"].waitForExistenceAndTap()
+        app.swipeUp() // scroll to see the checkout button
+        XCTAssertTrue(app.buttons["Checkout"].waitForExistence(timeout: 10))
         app.buttons["Checkout"].waitForExistenceAndTap()
+        XCTAssertTrue(app.buttons["Checkout"].isEnabled)
         payWithApplePay()
         XCTAssertTrue(app.staticTexts["Success!"].waitForExistence(timeout: 10))