From version 2.3 onwards, Land Measure Pro uses a subscription based In App purchase service provided by Apple.
To enable the service Apple collect such information as is required to manage your subscription including name, email address and zip code. These go directly to Apple same as with any iTunes transaction and I do not receive or store the information from the transaction separately.
Any information provided to me by Apple by way of sales reports may be used in the future if necessary for contacting customers about improvements to Land Measure Pro.