Locating the Transaction ID of your cryptocurrency withdrawal
1) Navigate to the 'History' section of your account
2) Select 'Withdrawals'
3) Locate the cryptocurrency withdrawal
4) Click 'View on Blockchain'
From there, you are directed to a public blockchain explorer that shows the wallet address that your withdrawal was sent to. Simply locate your withdrawal, and the transaction ID associated with it will be displayed.
Please note that this can currently only be performed on the Bitbuy website - not the mobile app