Although a vendor may manage several MLSs, each MLS system is unique and must have its own data set and API capabilities certified. RESO uses MLS access credentials supplied by MLS vendors to verify standards conformance. When an MLS system passes testing, the vendor will reach out to a designated MLS staff representative to ask for results confirmation and an acceptance of certification terms. Once that is completed, certification from RESO is granted.
More Info on Certification
