API Documentation Under this category, you will find the API documentation for Oempro. Plug-In Development Learn how to develop and package an Oempro plug-in. From action and filter hooks to references and libraries, everything related to Oempro plug-in development can be found under this category. Installation & Upgrade Please submit your installation and upgrade related questions and problems to this category. The community and Octeth Team will do their best to assist you.