A computing device for securely transacting over a landline is provided. The computing device is configured to receive, through a landline, from a merchant in response to a transaction request by a user, a merchant identification message including a merchant identifier, extract the merchant identifier from the merchant identification message, query a database of merchant data including a plurality of merchants and a plurality of merchant identifiers, identify, in response to the query, the merchant by matching the extracted merchant identifier against the plurality of merchant identifiers in the database, retrieve, in response to successfully identifying the merchant, a token associated with a PAN of the user, generate a token message including the token, transmit the token message to the merchant through the landline, and receive, from a payment processor, a confirmation message indicating a payment using the PAN was made in response to the merchant receiving the token.