The City of Miami has recently introduced a new Electronic Plan Review system (ePlan). This means that when it is time to submit your drawings and documents to the City of Miami, you are required to purchase a Document Signing Certificate from a certificate authority. This article explains the steps. The City of Miami has recently introduced a new Electronic Plan Review system (ePlan). This means that when it is time to submit your drawings and documents to the City of Miami, you are required to purchase a Document Signing Certificate from a certificate authority. This article explains the steps.