Transaction services include providing, to a computer system of an entity via a first user interface, a transaction service template having data fields configured to specify items and identifiers of physical locations in which each of the items resides. The transaction services also include receiving the transaction service template including entries presented in the data fields, the transaction service template mapping the items to corresponding physical locations. Transaction services further include providing a second user interface to an end user device, the second user interface including a portion of the data fields of the transaction service template. In response to a transaction request that includes one of the items, the transaction services also include populating an identifier of a corresponding physical location of the item in the transaction request within the second user interface as a transaction response.