export declare function generateOtp(): string;
export declare function checkOtpRateLimit(phone: string): Promise<boolean>;
export declare function storeOtp(phone: string, otp: string): Promise<void>;
export declare function verifyOtp(phone: string, otp: string): Promise<boolean>;
export declare function sendOtpSms(phone: string, otp: string): Promise<void>;
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