Addition of custom attributes in orders API

Addition of custom attributes in orders API

appicdevices
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I'm trying to save custom attribute named "firebaseID" to the orders API through the page named "main-cart-footer.liquid" but failing to do so. How can I achieve this task?

 

I have attached a file below showing the code I used to do so on line 385

Screenshot 2023-04-19 at 11.04.11 AM.png
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