Follow below mentioned steps to enable split transfer in taxi feature:
Step 1: Once you have created your app, go back to Creator Software Area
Step 2: Add Taxi feature
Step 3 : Click on Save & Continue
Step 4 : Click on Taxi Service
Step 5 : Click on Settings icon present on the top right hand corner
Step 6 :Go to Payment Settings
Step 7 :Turn Allow Split Transfer on
Step 8 : Enter Live Client ID. You can follow our tutorial - - by clicking on i icon here to get Live Client ID