# Development

- [How to create integrations](https://docs.frends.com/guides/development/how-to-create-integrations.md): Guide to creating Processes with Frends.
- [Creating a Subprocess](https://docs.frends.com/guides/development/creating-a-subprocess.md): How to create a reusable part to your Processes.
- [How to Manually Execute a Process](https://docs.frends.com/guides/development/how-to-manually-execute-a-process.md): Useful for integration testing as well as for manually performing tasks.
- [How to Test Processes and Tasks](https://docs.frends.com/guides/development/how-to-test-processes-and-tasks.md): How to run single Tasks and Processes for testing.
- [Using Expressions in Frends Processes](https://docs.frends.com/guides/development/using-expressions-in-frends-processes.md): Adding simple C# code and reference values to your Processes.
- [Iteration in Frends Processes](https://docs.frends.com/guides/development/iteration-in-frends-processes.md): How to iterate using While, ForEach and Code Task shapes.
- [How to create and use Environment Variables](https://docs.frends.com/guides/development/how-to-create-and-use-environment-variables.md): How to create Environment Variables in Frends.
- [How to listen for SFTP folder changes](https://docs.frends.com/guides/development/how-to-listen-for-sftp-folder-changes.md): Using Conditional Trigger to poll for SFTP directory.
- [How to handle errors in Frends Processes](https://docs.frends.com/guides/development/how-to-handle-errors-in-frends-processes.md): Collection of methods to properly handle errors in Processes.
- [Handling Files in Frends](https://docs.frends.com/guides/development/handling-files-in-frends.md): How to handle incoming and outgoing files in Frends Processes.
- [How to Accept File Uploads & Multipart data to an API](https://docs.frends.com/guides/development/how-to-accept-file-uploads-and-multipart-data-to-an-api.md): Receiving binary and multipart data to your API or HTTP Trigger.
- [How to work with SOAP in Frends](https://docs.frends.com/guides/development/how-to-work-with-soap-in-frends.md): Sending and receiving SOAP messages with Frends.
- [Using DMN Task in Frends Processes](https://docs.frends.com/guides/development/using-dmn-task-in-frends-processes.md): How to simplify decision trees with DMN Task.
- [Frends Process Optimization](https://docs.frends.com/guides/development/frends-process-optimization.md): How to optimize performance in Frends Processes.


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