braintree-android-drop-in: ClassNotFoundException: com.braintreepayments.api.dropin.DropInRequest

General information

• SDK/Library version: API 27 | Braintree Android 2.6.2/Drop-in 3.1/Card 5.1.1
• Gradle version: 4.4.1
• Environment: Sandbox
• Android Version and Device: Galaxy S7/7.0

Issue description

I’m working with this library in relation to the cordova-plugin-braintree library. Building the app works great, but when I tap on the drop-in UI, the app crashes and I see the following in the logs:

Class not found when unmarshalling: com.braintreepayments.api.dropin.DropInRequest
ClassNotFoundException: com.braintreepayments.api.dropin.DropInRequest

Here’s the gradle file for the plugin:

def packageName = getPackageName()

android {
    defaultConfig {
        applicationId packageName
    }
}

dependencies {
    compile 'com.braintreepayments.api:braintree:2.3.12'
    compile 'com.braintreepayments.api:drop-in:3.0.1'
    compile 'io.card:android-sdk:5.4.1'
}

def getPackageName() {
    def config = file("res/xml/config.xml").getText()
    def xml = new XmlParser(false, false).parseText(config)
    return xml.attribute("id")
}

I realize that this may not be directly related to the SDK, so just hoping for some pointers on what I might look for. Appreciated!