The transaction request sent by you is incorrect. Listed below are mandatory attributes required in transaction request along with debugging details. Kindly check
MID
missing: This attribute is not passed. It is a mandatory attribute
ORDER_ID
missing: This attribute is not passed. It is a mandatory attribute
Order Time: Jul 20, 2019 7:59:20 PM
Click here for a complete list of required parameters to fix this error. If you still have trouble integrating Checkout, email us a screenshot of this page on devsupport@paytm.com