method CartMandateClass.prototype.sign CartMandateClass.prototype.sign(privateKey: string,keyConfig?: Partial<JWTKeyConfig>,merchantInfo: { merchantId: string; },): Promise<void> Sign mandate using JWT with merchant authorization Creates a JWT with cart hash for integrity verification Parameters privateKey: string optional keyConfig: Partial<JWTKeyConfig> merchantInfo: { merchantId: string; } Return Type Promise<void>