Found it! All due to a simple spelling mistake in the OrderRespone model - 'CondingKeys' instead of 'CodingKeys'
I feel so stupid!
grin_phi
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I'm banging my head against the same issue years later!
Preparation is spelt correctly in my coding keys but when I print the value of 'data' I'm getting:
Optional("{"preparation_time":20}")
I don't know if the additional symbols and punctuation are an issue or not.