When you make a payment using Coinbase, you will need to send us the transaction ID (transaction hash) following the steps bellow:

1. Open Coinbase.
2. Go to My Assets.
3. Choose the cryptocurrency you used for the payment. In this case, simply select Bitcoin.
4. Go to Primary Balance and choose your transaction.
5. Click on Block Explorer. 
6. Once you open the link, you will find the transaction ID (Hash ID). 
7. Copy the transaction ID (Hash ID) and send it to us.

You can also check the video bellow: