New endpoints for Card Validation and adding in RemainingFunds feature, minor fixes v3.1.2

Update 📦 3.1.2

💳 New endpoint to support changes to Card Validation process (please listen out for product announcements 👂 )
💯 New RemainingFunds Parameters (Complete feature not fully activated, please listen for 👂 product announcements)
Fix to PayInWebExtendedView 🔧