datatrans payment library integrated for twint and postfinance

app/build.gradle

@@ -96,9 +96,10 @@ dependencies {
         exclude group: 'com.braintreepayments.api', module: 'braintree'
     }
     implementation('com.crashlytics.sdk.android:crashlytics:2.9.4@aar') {
-        transitive = true;
+        transitive = true
     }
 
+    implementation(name:'datatrans_payment_v3.5.1', ext:'aar')
     api 'com.google.guava:guava:26.0-android'
     testImplementation 'junit:junit:4.12'
 }