Take a deposit when customers book through your Booking Page, then collect the remainder after the work is done. Straightforward for you, clear for the customer. You'll need your payment processor connected before setting this up.
Set Up Deposits on Your Booking Page
Go to Settings > Payments > Booking Page payments.
Flip the Accept payments on my Booking Page switch to On.
Click Add Charges or Reduction. The Create charge or reduction menu will appear.
For Type, select Reduction. For Name, enter something your customers will recognise - "Deposit" works well. This label is visible to customers at checkout.
For Apply as, select Percentage and enter the deposit percentage as a reduction of the total. If you want a 20% deposit, enter a reduction of 80%.
Click Save changes.
What Customers See at Checkout
Customers are prompted to pay the service cost minus the percentage you've set. The full price is visible (so there's no confusion), but only the deposit amount is charged at the time of booking.
Collecting the Remainder Through Your Calendar
Open your calendar and click the relevant appointment, then select Edit Appointment.
Click the Payment tab or the Pay now button.
In Payment History, you'll see the deposit that's already been paid. Click New Payment to process the balance.
Enter the remaining amount, either by manually adjusting the total, using Add More, or applying a discount. Click Charge Customer when ready.
Payment History will now show both transactions, covering the full service cost.