safeapp-notifier 0.7.0

use serde::{
    Deserialize, Deserializer, Serialize, Serializer,
    de::{self, Visitor},
};
use std::fmt;

#[derive(Debug, Clone, PartialEq, Eq)]
pub enum EventKey {
    Account(AccountEventKey),
    Sync(SyncEventKey),
}

impl EventKey {
    pub fn as_str(&self) -> &'static str {
        match self {
            EventKey::Account(key) => key.as_str(),
            EventKey::Sync(key) => key.as_str(),
        }
    }

//    pub fn to_subject(&self) -> String {
//         match self {
//             EventKey::Account(account_key) => match account_key {
//                 // account.*
//                 AccountEventKey::Welcome => "Welcome to Safe — your AI guard against chargebacks".to_string(),
//                 AccountEventKey::TierUpgrade => "You’ve been upgraded".to_string(),
//                 AccountEventKey::ExistingChargebacks => "You have open chargebacks".to_string(),
//                 AccountEventKey::HighChargebackRatioWarning => "Warning: chargeback rate rising".to_string(),
//                 AccountEventKey::ProviderDisconnected => "Action needed: connection disconnected".to_string(),

//                 // billing.* (modeled under Account)
//                 AccountEventKey::BillingPaymentFailed => "Payment failed".to_string(),
//                 AccountEventKey::BillingInvoiceReady => "Invoice ready".to_string(),
//             },

//             EventKey::Sync(sync_key) => match sync_key {
//                 // sync.connection.*
//                 SyncEventKey::Connection(connection_key) => match connection_key {
//                     ConnectionEventKey::Finished => "Sync complete — Safe is watching for disputes".to_string(),
//                     ConnectionEventKey::Added => "Connection successful — monitoring enabled".to_string(),
//                 },

//                 // sync.disputer.*
//                 SyncEventKey::Disputer(disputer_key) => match disputer_key {
//                     DisputerEventKey::PendingCharges(pending_key) => match pending_key {
//                         PendingChargeEventKey::Payment => "Pending charges payment processed".to_string(),
//                         PendingChargeEventKey::LimitReached => "Pending charges limit reached".to_string(),
//                         PendingChargeEventKey::Added => "New pending charge added".to_string(),
//                     },
//                     DisputerEventKey::Disputes(dispute_key) => match dispute_key {
//                         DisputeEventKey::Created => "New dispute detected".to_string(),
//                         DisputeEventKey::Won => "🎉 You won a chargeback".to_string(),
//                         DisputeEventKey::Lost => "Outcome: dispute lost".to_string(),
//                     },
//                     DisputerEventKey::Evidences(evidence_key) => match evidence_key {
//                         EvidencesEventKey::Submitted => "Dispute response submitted".to_string(),
//                     },
//                 },

//                 // sync.connection.not_created.nudge_day_*
//                 SyncEventKey::ConnectionNudge(nudge_key) => match nudge_key {
//                     ConnectionNudgeKey::Day1  => "Connect your account to start protection".to_string(),
//                     ConnectionNudgeKey::Day2  => "Prevent disputes before they start".to_string(),
//                     ConnectionNudgeKey::Day4  => "Win disputes automatically with Disputer".to_string(),
//                     ConnectionNudgeKey::Day7  => "You’re close — finish connecting".to_string(),
//                     ConnectionNudgeKey::Day30 => "Still here when you’re ready".to_string(),
//                 },

//                 // sync.chargeback.*
//                 SyncEventKey::Chargeback(cb_key) => match cb_key {
//                     ChargebackEventKey::Detected => "New chargeback detected".to_string(),
//                 },

//                 // sync.response.*
//                 SyncEventKey::Response(resp_key) => match resp_key {
//                     ResponseEventKey::DeadlineApproaching => "Urgent: response deadline approaching".to_string(),
//                 },

//                 // sync.stopper.*
//                 SyncEventKey::Stopper(stopper_key) => match stopper_key {
//                     StopperEventKey::PreChargebackAlert => "At-risk transaction detected".to_string(),
//                     StopperEventKey::AutoRefundExecuted => "Auto-refund executed".to_string(),
//                 },

//                 // sync.rules.*
//                 SyncEventKey::Rules(rules_key) => match rules_key {
//                     RulesEventKey::Created => "Rule created".to_string(),
//                     RulesEventKey::TriggeredAutoRefund => "Rule triggered: Auto-refund".to_string(),
//                 },
//             },
//         }
//     }
}

// Custom serialization (unchanged)
impl Serialize for EventKey {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_str(self.as_str())
    }
}

// Custom deserialization with fallback for unknown keys
impl<'de> Deserialize<'de> for EventKey {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        struct EventKeyVisitor;

        impl<'de> Visitor<'de> for EventKeyVisitor {
            type Value = EventKey;

            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
                formatter.write_str("a valid event key string")
            }

            fn visit_str<E>(self, value: &str) -> Result<EventKey, E>
            where
                E: de::Error,
            {
                match value {
                    "account.welcome" => Ok(keys::ACCOUNT_WELCOME),
                    "account.tier_upgrade" => Ok(keys::ACCOUNT_TIER_UPGRADE),
                    "sync.connection.finished" => Ok(keys::SYNC_CONNECTION_FINISHED),
                    "sync.connection.added" => Ok(keys::SYNC_CONNECTION_ADDED),
                    "sync.disputer.pending_charges.payment" => Ok(keys::SYNC_DISPUTER_PENDING_CHARGES_PAYMENT),
                    "sync.disputer.pending_charges.limit_reached" => {
                        Ok(keys::SYNC_DISPUTER_PENDING_CHARGES_LIMIT_REACHED)
                    }
                    "sync.disputer.pending_charges.added" => Ok(keys::SYNC_DISPUTER_PENDING_CHARGES_ADDED),
                    "sync.disputer.disputes.created" => Ok(keys::SYNC_DISPUTER_DISPUTES_CREATED),
                    "sync.disputer.disputes.won" => Ok(keys::SYNC_DISPUTER_DISPUTES_WON),
                    "sync.disputer.disputes.lost" => Ok(keys::SYNC_DISPUTER_DISPUTES_LOST),
                    "sync.disputer.disputes.warning_closed" => Ok(keys::SYNC_DISPUTER_DISPUTES_WARNING_CLOSED),
                    "sync.disputer.disputes.missing_evidence_reminder" => Ok(keys::SYNC_DISPUTER_DISPUTES_MISSING_EVIDENCE_REMINDER),
                    "sync.disputer.evidences.submitted" => Ok(keys::SYNC_DISPUTER_EVIDENCES_SUBMITTED),
                    "sync.disputer.evidences.received" => Ok(keys::SYNC_DISPUTER_EVIDENCES_RECEIVED),
                    "sync.connection.not_created.nudge_day_1" => Ok(keys::SYNC_CONNECTION_NUDGE_DAY1),
                    // connection nudges
                    "sync.connection.not_created.nudge_day_2"  => Ok(keys::SYNC_CONNECTION_NUDGE_DAY2),
                    "sync.connection.not_created.nudge_day_4"  => Ok(keys::SYNC_CONNECTION_NUDGE_DAY4),
                    "sync.connection.not_created.nudge_day_7"  => Ok(keys::SYNC_CONNECTION_NUDGE_DAY7),
                    "sync.connection.not_created.nudge_day_30" => Ok(keys::SYNC_CONNECTION_NUDGE_DAY30),

                    // chargeback + response
                    // "sync.chargeback.detected"             => Ok(keys::SYNC_CHARGEBACK_DETECTED),
                    "sync.response.deadline.approaching"   => Ok(keys::SYNC_RESPONSE_DEADLINE_APPROACHING),

                    // stopper
                    // "sync.stopper.pre_chargeback_alert"    => Ok(keys::SYNC_STOPPER_PRE_CHARGEBACK_ALERT),
                    // "sync.stopper.auto_refund_executed"    => Ok(keys::SYNC_STOPPER_AUTO_REFUND_EXECUTED),

                    // rules
                    // "sync.rules.created"                   => Ok(keys::SYNC_RULES_CREATED),
                    // "sync.rules.triggered.auto_refund"     => Ok(keys::SYNC_RULES_TRIGGERED_AUTO_REFUND),

                    // account extras
                    "account.existing_chargebacks"         => Ok(keys::ACCOUNT_EXISTING_CHARGEBACKS),
                    "account.high_chargeback_ratio_warning"=> Ok(keys::ACCOUNT_HIGH_CHARGEBACK_RATIO_WARNING),
                    "account.provider_disconnected"        => Ok(keys::ACCOUNT_PROVIDER_DISCONNECTED),

                    // billing (mapped under Account variant)
                    "billing.payment_failed"               => Ok(keys::BILLING_PAYMENT_FAILED),
                    "billing.invoice_ready"                => Ok(keys::BILLING_INVOICE_READY),

                    // NEW billing email template keys
                    "welcome"                              => Ok(keys::BILLING_WELCOME),
                    "payment_succeeded"                    => Ok(keys::BILLING_PAYMENT_SUCCEEDED),
                    "payment_failed"                       => Ok(keys::BILLING_PAYMENT_FAILED_2),
                    "overage_invoice_created"              => Ok(keys::BILLING_OVERAGE_INVOICE_CREATED),
                    "upcoming_invoice"                     => Ok(keys::BILLING_UPCOMING_INVOICE),
                    "trial_expired"                        => Ok(keys::BILLING_TRIAL_EXPIRED),
                    "trial_ending"                         => Ok(keys::BILLING_TRIAL_ENDING),
                    "trial_started"                        => Ok(keys::BILLING_TRIAL_STARTED),
                    "plan_downgraded"                      => Ok(keys::BILLING_PLAN_DOWNGRADED),
                    "plan_upgraded"                        => Ok(keys::BILLING_PLAN_UPGRADED),
                    "plan_renewed"                         => Ok(keys::BILLING_PLAN_RENEWED),
                    "plan_cancelled"                       => Ok(keys::BILLING_PLAN_CANCELLED),
                    "plan_purchased"                       => Ok(keys::BILLING_PLAN_PURCHASED),

                    unknown => {
                        // Optionally log unknown keys for debugging
                        eprintln!("Unknown event key '{}', expected a known key", unknown);
                        Err(de::Error::custom(format!("Unknown event key: {}", unknown)))
                    }
                }
            }
        }

        deserializer.deserialize_str(EventKeyVisitor)
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum AccountEventKey {
    Welcome,
    TierUpgrade,

    // NEW account.* keys
    ExistingChargebacks,
    HighChargebackRatioWarning,
    ProviderDisconnected,

    // NEW billing.* (mapped under Account)
    BillingPaymentFailed,
    BillingInvoiceReady,

    // NEW billing email template keys
    BillingWelcome,
    BillingPaymentSucceeded,
    BillingPaymentFailed2,
    BillingOverageInvoiceCreated,
    BillingUpcomingInvoice,
    BillingTrialExpired,
    BillingTrialEnding,
    BillingTrialStarted,
    BillingPlanDowngraded,
    BillingPlanUpgraded,
    BillingPlanRenewed,
    BillingPlanCancelled,
    BillingPlanPurchased,
}

impl AccountEventKey {
    pub fn as_str(&self) -> &'static str {
        match self {
            AccountEventKey::Welcome                     => "account.welcome",
            AccountEventKey::TierUpgrade                 => "account.tier_upgrade",
            AccountEventKey::ExistingChargebacks         => "account.existing_chargebacks",
            AccountEventKey::HighChargebackRatioWarning  => "account.high_chargeback_ratio_warning",
            AccountEventKey::ProviderDisconnected        => "account.provider_disconnected",
            AccountEventKey::BillingPaymentFailed        => "billing.payment_failed",
            AccountEventKey::BillingInvoiceReady         => "billing.invoice_ready",
            AccountEventKey::BillingWelcome              => "welcome",
            AccountEventKey::BillingPaymentSucceeded     => "payment_succeeded",
            AccountEventKey::BillingPaymentFailed2       => "payment_failed",
            AccountEventKey::BillingOverageInvoiceCreated => "overage_invoice_created",
            AccountEventKey::BillingUpcomingInvoice      => "upcoming_invoice",
            AccountEventKey::BillingTrialExpired         => "trial_expired",
            AccountEventKey::BillingTrialEnding          => "trial_ending",
            AccountEventKey::BillingTrialStarted         => "trial_started",
            AccountEventKey::BillingPlanDowngraded       => "plan_downgraded",
            AccountEventKey::BillingPlanUpgraded         => "plan_upgraded",
            AccountEventKey::BillingPlanRenewed          => "plan_renewed",
            AccountEventKey::BillingPlanCancelled        => "plan_cancelled",
            AccountEventKey::BillingPlanPurchased        => "plan_purchased",
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum SyncEventKey {
    Connection(ConnectionEventKey),
    Disputer(DisputerEventKey),

    // already there:
    ConnectionNudge(ConnectionNudgeKey),

    // NEW:
    // Chargeback(ChargebackEventKey),
    Response(ResponseEventKey),
    // Stopper(StopperEventKey),
    // Rules(RulesEventKey),
}

impl SyncEventKey {
    pub fn as_str(&self) -> &'static str {
        match self {
            SyncEventKey::Connection(key)      => key.as_str(),
            SyncEventKey::Disputer(key)        => key.as_str(),
            SyncEventKey::ConnectionNudge(key) => key.as_str(),
            // SyncEventKey::Chargeback(key)      => key.as_str(),
            SyncEventKey::Response(key)        => key.as_str(),
            // SyncEventKey::Stopper(key)         => key.as_str(),
            // SyncEventKey::Rules(key)           => key.as_str(),
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum ConnectionEventKey {
    Finished,
    Added,
}

impl ConnectionEventKey {
    pub fn as_str(&self) -> &'static str {
        match self {
            ConnectionEventKey::Finished => "sync.connection.finished",
            ConnectionEventKey::Added => "sync.connection.added",
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum DisputerEventKey {
    PendingCharges(PendingChargeEventKey),
    Disputes(DisputeEventKey),
    Evidences(EvidencesEventKey),
}

impl DisputerEventKey {
    pub fn as_str(&self) -> &'static str {
        match self {
            DisputerEventKey::PendingCharges(key) => key.as_str(),
            DisputerEventKey::Disputes(key) => key.as_str(),
            DisputerEventKey::Evidences(key) => key.as_str(),
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum DisputeEventKey {
    Created,
    Won,
    Lost,
    WarningClosed,
    MissingEvidenceReminder
}

impl DisputeEventKey {
    pub fn as_str(&self) -> &'static str {
        match self {
            DisputeEventKey::Created => "sync.disputer.disputes.created",
            DisputeEventKey::Won => "sync.disputer.disputes.won",
            DisputeEventKey::Lost => "sync.disputer.disputes.lost",
            DisputeEventKey::WarningClosed => "sync.disputer.disputes.warning_closed",
            DisputeEventKey::MissingEvidenceReminder => "sync.disputer.disputes.missing_evidence_reminder",
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum PendingChargeEventKey {
    Payment,
    LimitReached,
    Added,
}

impl PendingChargeEventKey {
    pub fn as_str(&self) -> &'static str {
        match self {
            PendingChargeEventKey::Payment => "sync.disputer.pending_charges.payment",
            PendingChargeEventKey::LimitReached => "sync.disputer.pending_charges.limit_reached",
            PendingChargeEventKey::Added => "sync.disputer.pending_charges.added",
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum EvidencesEventKey {
    Submitted,
    Received,
}

impl EvidencesEventKey {
    pub fn as_str(&self) -> &'static str {
        match self {
            EvidencesEventKey::Submitted => "sync.disputer.evidences.submitted",
            EvidencesEventKey::Received => "sync.disputer.evidences.received",
        }
    }
}

// --- Connection Nudges (extend what you already have) ---
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum ConnectionNudgeKey {
    Day1,
    Day2,
    Day4,
    Day7,
    Day30,
}

impl ConnectionNudgeKey {
    pub fn as_str(&self) -> &'static str {
        match self {
            ConnectionNudgeKey::Day1  => "sync.connection.not_created.nudge_day_1",
            ConnectionNudgeKey::Day2  => "sync.connection.not_created.nudge_day_2",
            ConnectionNudgeKey::Day4  => "sync.connection.not_created.nudge_day_4",
            ConnectionNudgeKey::Day7  => "sync.connection.not_created.nudge_day_7",
            ConnectionNudgeKey::Day30 => "sync.connection.not_created.nudge_day_30",
        }
    }
}

// // --- Chargeback ---
// #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
// pub enum ChargebackEventKey {
//     Detected,
// }
// impl ChargebackEventKey {
//     pub fn as_str(&self) -> &'static str {
//         match self {
//             ChargebackEventKey::Detected => "sync.chargeback.detected",
//         }
//     }
// }

// --- Response (deadlines etc) ---
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum ResponseEventKey {
    DeadlineApproaching,
}
impl ResponseEventKey {
    pub fn as_str(&self) -> &'static str {
        match self {
            ResponseEventKey::DeadlineApproaching => "sync.response.deadline.approaching",
        }
    }
}

// --- Stopper (pre-chargeback / actions) ---
// #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
// pub enum StopperEventKey {
//     PreChargebackAlert,
//     AutoRefundExecuted,
// }
// impl StopperEventKey {
//     pub fn as_str(&self) -> &'static str {
//         match self {
//             StopperEventKey::PreChargebackAlert => "sync.stopper.pre_chargeback_alert",
//             StopperEventKey::AutoRefundExecuted => "sync.stopper.auto_refund_executed",
//         }
//     }
// }

// // --- Rules (created / triggered) ---
// #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
// pub enum RulesEventKey {
//     Created,
//     TriggeredAutoRefund,
// }
// impl RulesEventKey {
//     pub fn as_str(&self) -> &'static str {
//         match self {
//             RulesEventKey::Created => "sync.rules.created",
//             RulesEventKey::TriggeredAutoRefund => "sync.rules.triggered.auto_refund",
//         }
//     }
// }

pub mod keys {
    use super::*;

    pub const ACCOUNT_WELCOME: EventKey = EventKey::Account(AccountEventKey::Welcome);
    pub const ACCOUNT_TIER_UPGRADE: EventKey = EventKey::Account(AccountEventKey::TierUpgrade);

    pub const SYNC_CONNECTION_FINISHED: EventKey =
        EventKey::Sync(SyncEventKey::Connection(ConnectionEventKey::Finished));
        
    pub const SYNC_CONNECTION_ADDED: EventKey = EventKey::Sync(SyncEventKey::Connection(ConnectionEventKey::Added));

    pub const SYNC_DISPUTER_PENDING_CHARGES_PAYMENT: EventKey = EventKey::Sync(SyncEventKey::Disputer(
        DisputerEventKey::PendingCharges(PendingChargeEventKey::Payment),
    ));
    pub const SYNC_DISPUTER_PENDING_CHARGES_LIMIT_REACHED: EventKey = EventKey::Sync(SyncEventKey::Disputer(
        DisputerEventKey::PendingCharges(PendingChargeEventKey::LimitReached),
    ));
    pub const SYNC_DISPUTER_PENDING_CHARGES_ADDED: EventKey = EventKey::Sync(SyncEventKey::Disputer(
        DisputerEventKey::PendingCharges(PendingChargeEventKey::Added),
    ));
    pub const SYNC_DISPUTER_DISPUTES_CREATED: EventKey = EventKey::Sync(SyncEventKey::Disputer(
        DisputerEventKey::Disputes(DisputeEventKey::Created),
    ));
    pub const SYNC_DISPUTER_DISPUTES_WON: EventKey =
        EventKey::Sync(SyncEventKey::Disputer(DisputerEventKey::Disputes(DisputeEventKey::Won)));
    pub const SYNC_DISPUTER_DISPUTES_LOST: EventKey = EventKey::Sync(SyncEventKey::Disputer(
        DisputerEventKey::Disputes(DisputeEventKey::Lost),
    ));
    pub const SYNC_DISPUTER_DISPUTES_WARNING_CLOSED: EventKey = EventKey::Sync(SyncEventKey::Disputer(
        DisputerEventKey::Disputes(DisputeEventKey::WarningClosed),
    ));
    pub const SYNC_DISPUTER_DISPUTES_MISSING_EVIDENCE_REMINDER: EventKey = EventKey::Sync(SyncEventKey::Disputer(
        DisputerEventKey::Disputes(DisputeEventKey::MissingEvidenceReminder),
    ));
    pub const SYNC_DISPUTER_EVIDENCES_SUBMITTED: EventKey = EventKey::Sync(SyncEventKey::Disputer(
        DisputerEventKey::Evidences(EvidencesEventKey::Submitted),
    ));
    pub const SYNC_DISPUTER_EVIDENCES_RECEIVED: EventKey = EventKey::Sync(SyncEventKey::Disputer(
        DisputerEventKey::Evidences(EvidencesEventKey::Received),
    ));
    
    pub const SYNC_CONNECTION_NUDGE_DAY1: EventKey = EventKey::Sync(SyncEventKey::ConnectionNudge(ConnectionNudgeKey::Day1));

    pub const SYNC_CONNECTION_NUDGE_DAY2: EventKey =
        EventKey::Sync(SyncEventKey::ConnectionNudge(ConnectionNudgeKey::Day2));
    pub const SYNC_CONNECTION_NUDGE_DAY4: EventKey =
        EventKey::Sync(SyncEventKey::ConnectionNudge(ConnectionNudgeKey::Day4));
    pub const SYNC_CONNECTION_NUDGE_DAY7: EventKey =
        EventKey::Sync(SyncEventKey::ConnectionNudge(ConnectionNudgeKey::Day7));
    pub const SYNC_CONNECTION_NUDGE_DAY30: EventKey =
        EventKey::Sync(SyncEventKey::ConnectionNudge(ConnectionNudgeKey::Day30));

    // pub const SYNC_CHARGEBACK_DETECTED: EventKey =
    //     EventKey::Sync(SyncEventKey::Chargeback(ChargebackEventKey::Detected));

    pub const SYNC_RESPONSE_DEADLINE_APPROACHING: EventKey =
        EventKey::Sync(SyncEventKey::Response(ResponseEventKey::DeadlineApproaching));

    // pub const SYNC_STOPPER_PRE_CHARGEBACK_ALERT: EventKey =
    //     EventKey::Sync(SyncEventKey::Stopper(StopperEventKey::PreChargebackAlert));
    // pub const SYNC_STOPPER_AUTO_REFUND_EXECUTED: EventKey =
    //     EventKey::Sync(SyncEventKey::Stopper(StopperEventKey::AutoRefundExecuted));

    // pub const SYNC_RULES_CREATED: EventKey =
    //     EventKey::Sync(SyncEventKey::Rules(RulesEventKey::Created));
    // pub const SYNC_RULES_TRIGGERED_AUTO_REFUND: EventKey =
    //     EventKey::Sync(SyncEventKey::Rules(RulesEventKey::TriggeredAutoRefund));

    // Account-side new keys
    pub const ACCOUNT_EXISTING_CHARGEBACKS: EventKey =
        EventKey::Account(AccountEventKey::ExistingChargebacks);
    pub const ACCOUNT_HIGH_CHARGEBACK_RATIO_WARNING: EventKey =
        EventKey::Account(AccountEventKey::HighChargebackRatioWarning);
    pub const ACCOUNT_PROVIDER_DISCONNECTED: EventKey =
        EventKey::Account(AccountEventKey::ProviderDisconnected);

    // Billing (kept under Account to avoid new top-level variant)
    pub const BILLING_PAYMENT_FAILED: EventKey =
        EventKey::Account(AccountEventKey::BillingPaymentFailed);
    pub const BILLING_INVOICE_READY: EventKey =
        EventKey::Account(AccountEventKey::BillingInvoiceReady);

    // NEW billing email template keys
    pub const BILLING_WELCOME: EventKey =
        EventKey::Account(AccountEventKey::BillingWelcome);
    pub const BILLING_PAYMENT_SUCCEEDED: EventKey =
        EventKey::Account(AccountEventKey::BillingPaymentSucceeded);
    pub const BILLING_PAYMENT_FAILED_2: EventKey =
        EventKey::Account(AccountEventKey::BillingPaymentFailed2);
    pub const BILLING_OVERAGE_INVOICE_CREATED: EventKey =
        EventKey::Account(AccountEventKey::BillingOverageInvoiceCreated);
    pub const BILLING_UPCOMING_INVOICE: EventKey =
        EventKey::Account(AccountEventKey::BillingUpcomingInvoice);
    pub const BILLING_TRIAL_EXPIRED: EventKey =
        EventKey::Account(AccountEventKey::BillingTrialExpired);
    pub const BILLING_TRIAL_ENDING: EventKey =
        EventKey::Account(AccountEventKey::BillingTrialEnding);
    pub const BILLING_TRIAL_STARTED: EventKey =
        EventKey::Account(AccountEventKey::BillingTrialStarted);
    pub const BILLING_PLAN_DOWNGRADED: EventKey =
        EventKey::Account(AccountEventKey::BillingPlanDowngraded);
    pub const BILLING_PLAN_UPGRADED: EventKey =
        EventKey::Account(AccountEventKey::BillingPlanUpgraded);
    pub const BILLING_PLAN_RENEWED: EventKey =
        EventKey::Account(AccountEventKey::BillingPlanRenewed);
    pub const BILLING_PLAN_CANCELLED: EventKey =
        EventKey::Account(AccountEventKey::BillingPlanCancelled);
    pub const BILLING_PLAN_PURCHASED: EventKey =
        EventKey::Account(AccountEventKey::BillingPlanPurchased);

}