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What is the AppCode?
The code identifying the CLI, UI, service generating the order. It would be an UTF8 string of up to 50 chars
How to get your own AppCode
Assuming you are building a tool to interact with the protocol without using one of the existing UIs/interfaces, you are free to pick one for yourself.
Just make sure you reach out to CoW Swap team before using it to avoid picking an invalid or already existing AppCode.
For example, to use the AppCode "MyAwesomeUi" the JSON would look like:
"version": "0.4.0",
"appCode": "MyAwesomeUi",
"metadata": {}
On the next step you'll see what to do with this JSON.