/**
 * The `kit` object handed to the Klasha client as the 8th constructor argument.
 *
 * The fields the shipped `https://js.klasha.com/pay.js` actually reads are
 * `businessId`, `currency`, `redirect_url`, `email`, `phone`, `productType`,
 * `amount`, `sourceAmount`, `callBack` and `tx_ref`. Anything else is ignored.
 *
 * `pay.js` **mutates** the object it is given (it assigns `businessId`,
 * `currency` and `redirect_url`), so this library builds a fresh `kit` for every
 * payment instead of forwarding the caller's object.
 */
export interface KlashaKitOptions {
    /** Merchant business id. Assigned by `pay.js` itself if omitted. */
    businessId?: string | number;
    /** Currency the customer is charged in. */
    currency?: string;
    /** Where the gateway sends the customer after payment. Assigned by `pay.js`. */
    redirect_url?: string;
    /** Customer email address. */
    email?: string;
    /**
     * Customer phone number.
     *
     * This is the key `pay.js` reads — **not** `phone_number`.
     */
    phone?: string;
    /**
     * @deprecated `pay.js` never reads this key, so in 0.0.x the phone number was
     * silently dropped. Still accepted, and copied into `phone`.
     */
    phone_number?: string;
    /** Customer full name. Not read by `pay.js`; forwarded for convenience. */
    fullname?: string;
    /** Product/payment type shown on the checkout. */
    productType?: string;
    /** @deprecated `pay.js` reads `productType`. Copied into `productType`. */
    paymentType?: string;
    /** Amount in the destination currency. Defaults to the top-level `amount`. */
    amount?: number;
    /** Amount in the source currency, when it differs from `amount`. */
    sourceAmount?: number;
    /** Called by the gateway when the payment flow completes. */
    callBack?: Function;
    /** Unique transaction reference. Interpolated into the redirect URL. */
    tx_ref?: string;
}
export interface KlashaOptionsProps {
    /**
     * Use the Klasha test environment.
     *
     * This flag is the **only** thing that selects the environment: it is
     * forwarded as the 9th constructor argument. Versions 0.0.x never passed it,
     * so `isTestMode` integrations transacted against the live gateway.
     */
    isTestMode?: boolean;
    /**
     * Merchant's API key (found on the Klasha dashboard).
     */
    merchantKey: string;
    /**
     * Merchant's business id (found on the Klasha dashboard).
     */
    businessId: string | number;
    /**
     * The amount to be paid by the customer.
     */
    amount: number;
    /**
     * The currency the merchant is settled in. Defaults to `NGN`.
     */
    destinationCurrency?: string;
    /**
     * The currency the customer is charged in. Defaults to `NGN`.
     */
    sourceCurrency?: string;
    /**
     * Unique transaction reference. One is generated when omitted.
     */
    tx_ref?: string;
    /**
     * Full name of the customer.
     */
    fullname?: string;
    /**
     * Email address of the customer.
     */
    email?: string;
    /**
     * Phone number of the customer.
     */
    phone?: string;
    /**
     * @deprecated Use `phone`. Accepted as an alias for backwards compatibility.
     */
    phone_number?: string;
    /**
     * URL the gateway calls once the transaction completes.
     */
    callbackUrl?: string;
    /**
     * Description of what is being paid for.
     */
    paymentDescription?: string;
    /**
     * Extra data to keep alongside the transaction.
     */
    metadata?: Record<string, any>;
    /**
     * Extra `kit` fields forwarded to the Klasha client.
     */
    kit?: KlashaKitOptions;
    /**
     * Id of the element the checkout renders into. A unique one is created per
     * hook instance when omitted; supply your own only when the checkout has to
     * mount somewhere specific.
     */
    containerId?: string;
    'data-custom-button'?: string;
}
/** The instance `new window.KlashaClient(...)` returns. */
export interface KlashaClientInstance {
    init(): void;
}
/**
 * The constructor `https://js.klasha.com/pay.js` attaches to `window`.
 *
 * The argument order is verbatim from the shipped script. Note that the 6th
 * parameter is named `countryCode` inside `pay.js` but receives the destination
 * currency — that is the mapping the gateway expects, and it is what every
 * working integration sends. Klasha's own documentation page describes a
 * different, incorrect signature.
 */
export type KlashaClientConstructor = new (merchantKey: string, businessId: string | number, amount: number, containerId: string, callbackUrl: string, countryCode: string, sourceCurrency: string, kit: KlashaKitOptions, isTestMode: boolean) => KlashaClientInstance;
declare global {
    interface Window {
        KlashaClient?: KlashaClientConstructor;
    }
}