In Coinbase, transaction IDs can be viewed in the history of your assets. A transaction ID is produced every time an asset is sent or received.
Mobile
a) Tap Trade. Then b) tap on the asset of the transaction you sent.
Tap the Wallet tab.
Tap on the transaction.
Tap View on block explorer.
A block explorer will open in a browser. Tap on the clipboard icon to copy the transaction ID. If there's no clipboard icon, copy the complete string of characters onto your clipboard.
Desktop
Click on the Trade tab.
Click on the cryptocurrency you sent. If it's not in the initial list, you can search for it in the Search all assets field.
Click on the Wallet tab.
Click on the transaction.
A pop-up will appear. Click View transaction.
You can a) copy the transaction ID string or b) copy the URL and send it to us.
Once we have that information, we'll be able to investigate your deposit :)