If you have opted to use Sage Pay as a payment gateway with BookingBug, you will need to sign up for a Sage Pay Go Account.
There are some technical questions in the application form, the answers to which are:
Q: IP Address and Subnet Mask of server hosting checkout?
A: IP - 079.125.030.235 and Subnet Mask - 255.255.255.255
Q: Which type of service do you require?
A: VSP Direct
Q: Which shopping cart do you intend to use with your checkout?
A: Other / Bespoke
Once the account is active you will need to add the following IP addresses:
All subnet mask for all IP addresses would be 255.255.255.255