A master purchase agreement is a legally binding contract between buyer and seller, and typically relates to buying and selling goods rather than services. Learn how to properly complete and use the RPA to better serve and protect yourself and YOUR CLIENTS.The Sellers are the owners of all the Shares as set out in the Share Purchase Agreement. At any time after the. Our office only registers licenses issued in San Diego County. Appointments are available up to 7 weeks in advance and fill up quickly.