Proof of business relationship
We have established a good business relationship with XXX, with the term from 20 13 to 20 15. During the cooperation, XXX is serious and responsible, and XXX's business ability is recognized by relevant departments of the company. This certificate is only used to prove business relationship and is not used for other purposes.
XXX company (company seal)
20 1X year x month x day
By the way, in fact, if you show your cooperation invoices and bills, you can also prove that you have good business dealings.