It was narrated from 'Umar bin Al-Khattab that the Prophet said:
"Actions are but by intentions, and each person will have but that which he intended. Thus, he whose emigration was for the sake of Allah and His Messenger, his emigration was for the sake of Allah and His Messenger, and he whose emigration was to achieve some worldly gain or to take some woman in marriage, his emigration was for that for which he emigrated."
Intention is First step . If you paid within zakah intention its not zakah
May Allah reward you . When you pay for Allah ( with honest) Allah invest it for you .
Abu Hurairah (May Allah be pleased with him) reported:
Messenger of Allah (ﷺ) said, "He who gives in charity the value of a date which he legally earned, and Allah accepts only that which is pure, Allah accepts it with His Right Hand and fosters it for him, as one of you fosters his mare, until it becomes like a mountain."