fix remove error prone for loop function
loop contains variable n usage as maximum iteration without declaration
loop pushes merge, using undefined n maximum iteration without declaration
merge is only created once, it is a object, therefore there is no reason to push merge n times
merge is a string, n is an undefined maximum iteration without declaration, there is no indication to use merge string length again, resulting in no requirements to push merge
update schema support merchant_prefix
update form support merchant and merchant_prefix
Others unknown, automatically added