> ## Documentation Index
> Fetch the complete documentation index at: https://forest-chore-open-api.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Link users and Dwolla customers

The implementation of this [smart relationship (belongsTo](/legacy/ruby-agent/reference-guide/models/relationships/create-a-smart-relationship/overview#creating-a-belongsto-smart-relationship)) relies on a Dwolla service that will retrieve the Dwolla customer based on the user's email. The Dwolla service is described in [another section](/legacy/ruby-agent/reference-guide/integrations/dwolla/dwolla-service).