Adding Lyra
To accept payments through Lyra, you will need to add them as a provider.
Getting an account
If you need to sign up for a Lyra account, you can contact the support to create account here.
Adding Lyra to payFURL
You'll need your Username and Password.
You can use this to add Lyra as a provider in payFURL. Go to Providers, New Provider and select Provider Type Lyra:

Test account
You can also use test account from the documentation, "I do not have an active account" section
Username = 69876357
Password = testpassword_DEMOPRIVATEKEY23G4475zXZQ2UA5x7M