Array ( [0] => Array ( [customFieldId] => VUm4R0 [value] => yes ) )
{"customFieldValues":[{"customFieldId":"VUm4R0","value":"yes"}]}

{"httpStatus":404,"code":100001,"codeDescription":"Route not found, please check url","message":"Route not found - [requestedUrl => \/v3\/contacts\/\/custom-fields\/, requestedMethod => POST]","moreInfo":"https:\/\/apidocs.getresponse.com\/en\/v3\/errors\/100001","context":[],"uuid":"915aea97-505a-4653-b6b1-e9225fda0e03"}