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+# Porting an existing module that uses the old interface
+
+In order to port a module that uses Synapse's old module interface, its author needs to:
+
+* ensure the module's callbacks are all asynchronous.
+* register their callbacks using one or more of the `register_[...]_callbacks` methods
+  from the `ModuleApi` class in the module's `__init__` method (see [this section](writing_a_module.html#registering-a-callback)
+  for more info).
+
+Additionally, if the module is packaged with an additional web resource, the module
+should register this resource in its `__init__` method using the `register_web_resource`
+method from the `ModuleApi` class (see [this section](writing_a_module.html#registering-a-web-resource) for
+more info).
+
+The module's author should also update any example in the module's configuration to only
+use the new `modules` section in Synapse's configuration file (see [this section](index.html#using-modules)
+for more info).