There is a receipt setting feature in CBP that you have to enable. You will also have to fill out the messaging for the first time.
CBP (See first picture on left)
1. Click on Payments in the left menu in CBP
2. Click Settings on the top right.
3. Toggle on Receipts button to enable auto send feature.
4. Fill in the details of what you would like to include on your receipt.
Stripe - You can also send a stripe receipt manually. (See second and third pictures on left)
1. Click on Receipts found in the left menu.
2. Hover over the transaction line you're wanting to send from for envelope to pop up.
3. Click the envelope to send receipt.