export declare type BillingErrorReason = 'UNSUPPORTED_BILLING_SCHEDULE' | 'UNSUPPORTED_BILLING_CAP' | 'MISSING_BILLING_SOURCE' | 'MISSING_BILLING_SCHEDULE' | 'MISSING_BILLING_CAP' | 'INVALID_BILLING_SOURCE_FOR_OFFLINE' | 'UPDATE_BILLING_NOT_ALLOWED' | 'MISSING_BILLING_BASE' | 'INVALID_BILLING_BASE' | 'UNKNOWN';