Use date_accessor to define next_interval_start methods
Environment variables for client app_id and app_secret
These methods cannot be called directly because of the singleton methods defined by GoCardless::Resource#initialize.
The functionality defined in GoCardless::Resource#initialize for magically creating methods for sub resources is not merging query parameters correctly.
Remove explicit rubygems requires
Add cancel! method to GoCardless::PreAuthorization
Added paid_at accessor to the bill resource
Why not allow status to be accessed from PreAuthorization object?