https://invoice.zoho.com/api/GET/estimates/{$estimate_id}?authtoken={$auth}&organization_id={$org_id}

hello there, im using the above url to get the data from estimates module in zoho invoices, but i keep getting the following response

<Response status="0">

<Code>5</Code>

<Message>

<![CDATA[ Invalid URL Passed ]]>

</Message>

</Response>

can you please tell me, what im doing wrong here?