REST POST without input content only url with parameters

please kindly sent me pipeline example where i need to post to rest without any content.

i just need to send url to REST post to merge account in marketo


//1934- i will add dynamically
i dont have any input message or anything. please kindly advice how to sent.

what content type to use. I tried '“application/x-www-form-urlencoded” but it throwd invalid content type. please kindly suggest some solution.