[Refactor] PostAuth FRM flow

[srujanchikke]

This issues is regarding implementing revised PostAuth Frm. Below is the revised flow.

PostAuth flow

• The underlying FRM connector is invoked post authentication of the user from the bank.
• If a transaction’s capture method was set to automatic, it is updated to manual for avoiding automatic capture.
• Once the user completes the authentication, the underlying FRM connector is invoked. The decision whether or not to proceed with the txn is based on the status / score returned.

Possible actions based on the status

• Continue on Accept - Continue with the transaction
• Halt on Decline - Mark the transaction as cancelled
• Approve / Decline on Manual Review - Hold the txn in manual review state. Merchants can list and review such transactions. - If approved, payment is captured - If declined, payment is voided