ContributionsMost RecentMost LikesSolutionsRe: Observed missing_grant_type error in API response , when application/x-www-form-urlencoded used Format to be sent in request body as , client_id=1ddd4e5db347a5095f3e25e29c5ddfdgfg4&client_secret=de9fddfdfbfc0035ff08&grant_type=client_credentials Content -Type as -application/x-www-form-urlencoded Uncheck - Post Query String checkbox Add headers as , Content-Type , application/x-www-form-urlencoded. This will work for sure.