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# New optional response key in create and update contact response

New response key named `metadata` is added for create-contact and update-contact routes. This key is optional in response and is used for providing more information for the errors, if needed.

**Route:** [Create a contact](https://developers.brevo.com/reference/createcontact)\
**Route:** [Update a contact](https://developers.brevo.com/reference/updatecontact)