This document summarizes a 5 day proof of concept (POC) for integrating invoice data from an on-premise system into Salesforce using Lightning Connect. On day 1, the author requested connection information and learned invoices were stored in both ERP and a data warehouse. On day 2, they planned the data model relationship and learned to consult data experts. On day 3, they set up developer and trial accounts to produce OData. On day 4, they encountered an issue building a related list and got help from an online community. On day 5, Lightning Connect was enabled and they migrated the POC to a new sandbox for testing. Future projects were discussed to integrate additional systems using Lightning Connect.