A web-based application is executable on one or more computing devices, where execution of the web-based application involves invocation of at least one extension point. The one or more computing devices are configured to: (i) receive, by the web-based application and from a client device, a request for web-based content; (ii) receive, by an extension point service, a call to a particular extension point, where the particular extension point is related to the web-based content, (iii) request and receive, by the extension point service and in communication with a database, one or more implementations corresponding to the particular extension point, and (iv) transmit, by the extension point service and in response to the call to the particular extension point, one or more user-defined plugin scripts included in the one or more implementations, output from which is incorporated in the web-based content as displayed by the client device.