Methods and systems are disclosed for merchant system identity validation. One method comprises generating, by an access management system, a primary key associated with an integrator system and transmitting the primary key to the integrator system. The access management system may also generate a hash value associated with a merchant system, and may transmit the hash value to the merchant system. When a payment transaction is initiated at the merchant system, the access management system may receive an authorization request comprising a key-hash pair. The key-hash pair may be validated against a validation database. Upon successful validation, the access management system may transmit the authorization request to an acquirer processor.