Systems and methods are provided that enable a vendor to utilize a digital wallet service to complete an online transaction with a user via a messaging channel (e.g., a chat channel), in a scenario where the vendor does not have a front end application running on the user's client device (i.e., there is no mechanism for the vendor's web-based application, such as a bot, to communicate with a digital wallet application running on the user's device). An online digital wallet service generates and caches a payment request (which can be rendered at a later time by the digital wallet service for interaction with the user) which is requested by the vendor, and provides the vendor with a reference to the cached payment request. The vendor provides the reference to the user such that the user can access the payment request via the link.