You can link your wallet from the ride booking page or the Payments page in the sidebar. To link your AmazonPay wallet, please navigate to AmazonPay from either of these two pages.
For AmazonPay, the app will open a browser window within the app where you will be prompted to enter your Amazon Account credentials for accessing your account. Once successfully authenticated, Amazon will ask you if you want to give Ola access to your AmazonPay wallet. On selecting yes, the browser window will collapse and you will be able to see your linked AmazonPay wallet in the app, ready for you to use.