On API it’s clearly saying that, country_code is required if region is specified In our api request we’re not sending region just line1 or line2 for addresses like follows [addresses] => Array ( [0] => Array ( [line1] => shah ali bag, 243 lane, dhaka …

Create or Update contact issue with addresses

Nicholas_Trecina (Nicholas Trecina) August 21, 2018, 4:11pm 4

If you set the country_code field to a valid ISO code value it will allow you to save the contact without error.

"Billing region invalid" when PATCHing for custom fields

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