Your question isn't real clear. If you looking to extend credit to someone and want to check their references, most wholesalers require you to fax them a form to check credit references listed by the credit applicant. You'll want to know how long they've had credit with that company, their average days to pay, high credit limit and current amount owed and are they current.
Most every wholesaler in this industry belongs to NACM or National Assoc. of Credit Management.
NACM - National Association of Credit Management This allows them to share info about their customer pay habits, NSF checks high credit limits and such. They are not supposed to share this info with their sales departments.