To set up online payments using Stripe, please follow these steps:
Log in to https://stripe.com .
Click your account name in the upper right-hand corner to reveal a drop down list and click Account settings.
Click the API keys tab.
Copy your Live Secret key
In BookingBug, click the Cog/Settings icon > Advances Settings > Configure Online Payments.
Click Change and select Stripe.
Enter the API Key into that field.
Configure your other settings such as requiring payment to book, sending cancellation emails, etc.