curl --request GET \
--url https://api.sprucecollective.co.uk/admin/subscription-tiers \
--header 'Authorization: <api-key>'{}Retrieve all subscription tiers, optionally filtered by site identifier.
curl --request GET \
--url https://api.sprucecollective.co.uk/admin/subscription-tiers \
--header 'Authorization: <api-key>'{}