I am new to this forum and I am new to the United States. Currently, I have an offer from a food company from China that they want to export the food/snack to the USA. And I try the vendor applications on Walmart, but Walmart replies me that they need a certification of GFSI. But our company has already got the ISO22000, BRC-UK and HACCP certification. Is these certifications weight the same as GFSI? Or I need to apply for GFSI again in the United States?