A method including: receiving a purchasing policy; receiving, from a transaction terminal, a transaction authorization request including transaction authorization data associated with an attempted purchase made using a transaction card; determining, based on the transaction authorization data, purchase data; receiving a user profile corresponding to a user, associated with the transaction card, and past purchasing behavior data of the user; responsive to determining, based a comparison of the purchasing policy, the purchase data and the user profile, that the attempted purchase is suspicious, generating an attestation request; transmitting, to a user device associated with the user, the attestation request; receiving, from the user device, attestation data; and responsive to determining that the attestation data indicates that the attempted purchase comports with the purchasing policy, transmitting, to the transaction terminal, a transaction authorization approval to allow the attempted purchase.