# Annotations

- [PurchaseClient.ConnectionState](/dev/chi/tools/billing/v21/references/annotations/purchaseclient.connectionstate.md)
- [PurchaseClient.FeatureType](/dev/chi/tools/billing/v21/references/annotations/purchaseclient.featuretype.md)
- [PurchaseClient.ProductType](/dev/chi/tools/billing/v21/references/annotations/purchaseclient.producttype.md)
- [PurchaseClient.RecurringAction](/dev/chi/tools/billing/v21/references/annotations/purchaseclient.recurringaction.md)
- [PurchaseClient.ResponseCode](/dev/chi/tools/billing/v21/references/annotations/purchaseclient.responsecode.md)
- [PurchaseData.AcknowledgeState](/dev/chi/tools/billing/v21/references/annotations/purchasedata.acknowledgestate.md)
- [PurchaseData.PurchaseState](/dev/chi/tools/billing/v21/references/annotations/purchasedata.purchasestate.md)
- [PurchaseData.RecurringState](/dev/chi/tools/billing/v21/references/annotations/purchasedata.recurringstate.md)
- [PurchaseFlowParams.ProrationMode](/dev/chi/tools/billing/v21/references/annotations/purchaseflowparams.prorationmode.md)