I already bought here 4 panels of 150 watts 1 APsy...

I already bought here 4 panels of 150 watts 1 APsystems YC500A 127 VOLTS Microinverter, and accessories for it including the AC cable, I WOULD LIKE TO KNOW HOW TO PURCHASE THE GUARANTEE SERTIFICATE OF: APsystems YC500A 127 VOLTS Microinverter,