Check if number is WhatsApp user

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https://api.ultramsg.com/{{instance_id}}/contacts/check

token *Required
chatId *Required	chatID for contact e.g [email protected]
nocache *Required	default false Whether to check the contacts cache or not. Contact information is normally cached for 3 days. By setting the nocache parameter to true, the cache will be bypassed ensuring a check is performed.

Json

Note : don't forget to URL encode your query params like base64 or utf-8