Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
The API key to access the admin API
Returns all billing configs
Config key - either a type or plan code
timing_policy Config value - either a type or grace period days
immediate, next_cycle Config key type (e.g. upgrade, downgrade, terminate)
"upgrade"
Status Type (e.g. active)
"active"
Description of the billing config
"Immediate Upgrade"