Could one who has a congenital heart disease take green coffee beans?

Too vague: Congenital heart disease is an incredibly broad term, encompassing critical life-threatening & debilitating conditions as well as transient defects with no real clinical effect. With the more severe defects, any supplement or homeopathic medication should really be discussed with the PCP (especially if there is any history of arrhythmias), while mild defects may not need any special consideration.