About custom plug-ins
If you are a C or C++ programmer and familiar with calculations and scripts, you can create plug-ins. The plug-ins can take advantage of recursion and looping, or hook into other programming interfaces. To create a custom plug-in, you will need the FileMaker plug-in SDK.
To use plug-ins, users need to allow custom app files to install and enable plug-ins. For hosted files, the server administrator needs to allow the Install Plug-In File script step to update plug-ins installed on the server in Admin Console for FileMaker Server. FileMaker Cloud doesn't support plug-ins.
Overview of creating plug-ins
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Using C or C++, create a plug-in file.
The plug-in extension must be .fmx64 (Windows), .fmplugin (macOS), or .fmx (Linux).
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Compile and test the plug-in.
Though digitally signing your plug-in is optional, users will be asked whether to permit an unsigned plug-in to load. See Changing permitted hosts and plug-ins settings.
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Install the compiled plug-in file in a container field in your custom app. See Installing plug-ins.
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(optional) Set up the custom app to check the version of installed plug-ins and update them if needed. See Plug-in update example.
For more information on how to create a plug-in, see the FileMaker plug-in SDK.