How account kit work

1. client access token
-> you aren’t running your own servers
-> simpler to implement
-> long-lived token

2. authorization code (more secure)
-> all other cases
-> requires extra steps server-side
-> client never sees the token

repositories {
	jcenter()
}
allprojects {
	repositories {
		jcenter()
	}
}
dependencies {
	compile 'com.facebook.android:account-kit-sdk:4.+'
}