A method of associating a first party and a second party is provided, the method comprising: receiving a first electronic message comprising information indicative of the first party; generating a first electronic token in response to receiving the information indicative of the first party; sending the first electronic token to the first party; receiving one or more second electronic messages from the second party, the one or more second electronic messages comprising the first electronic token and information indicative of the second party; generating a second electronic token in response to receiving the first electronic token and the information indicative of the second party from the second party; associating the information indicative of the first party, the second party and the second electronic token, the first party being identified on the basis of the first electronic token; and sending the second electronic token to the first party.