zoho giving 414 error

I am using coldfusion to post a code to the Zoho Invoice API

So far so good, if i send a very Long Data in JSONString it throws me 414 error:

Here is the code which i am using

</cfhttp>

this way: it gives 414 error, if i try to pass JSONString in body without giving and with providing name, it says invalid JSONString like this

I do not understand if they have provided Method, why not accept the JSONString in body rather than in URL

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