/**
 * Generates a SHA256 postback hash for a Lootably postback.
 *
 * @param {Object} params - The parameters for generating the hash.
 * @param {string} params.userID - The user's ID from the postback.
 * @param {string} params.ip - The user's IP address from the postback.
 * @param {string} params.revenue - The revenue amount from the postback.
 * @param {string} params.currencyReward - The currency reward amount from the postback.
 * @param {string} params.postbackSecret - The secret key for your Lootably placement.
 * @param {boolean} [params.debug] - Optional. If true, logs debug information.
 * @returns {string} The generated SHA256 hash.
 */
export declare function generateSHA256PostbackHash({ userID, ip, revenue, currencyReward, postbackSecret, debug, }: {
    userID: string;
    ip: string;
    revenue: string;
    currencyReward: string;
    postbackSecret: string;
    debug?: true;
}): string;