There is provided an apparatus comprising means for: receiving, at a coordinating network function from a network function consumer, at least one data request, wherein the at least one data request indicates at least one version of an application programming interface supported by the network function consumer; and causing, by the coordinating network function, data to be provided to the network function consumer from at least one data source based on the at least one data request and one or more versions of an application programming interface supported by the at least one data source.