How to update custom fields?

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1

I am able to post and update email, firstName, lastName and phoneNumber but unable to post/update the custom fields for my contacts using the API v3?

What would the structure look like for updating custom fields?

Screen Shot 2020-02-20 at 6.02.33 PM
Screen Shot 2020-02-20 at 6.02.33 PM1204×792 55 KB

Thank you!

2

@flockjay Did you found any solutions for this?