"online authorisation" means the POS terminal authorizes the transaction with the issuer. EMV is a complicated protocol and that may not always happen for whatever reason. One example is the terminal has no internet connection but the terminal may also be programmed to not do it in certain cases for various reasons (eg. speed up checkout).
In these cases your issuer will learn about these transactions when the nightly batch job finishes. I don't think you want to get an SMS at that time.
Even if the authorisation is successful the final transaction may not happen, may happen at a different time or may happen over a different transaction amount.
In these cases your issuer will learn about these transactions when the nightly batch job finishes. I don't think you want to get an SMS at that time.
Even if the authorisation is successful the final transaction may not happen, may happen at a different time or may happen over a different transaction amount.
Honestly I have no idea why I got downvoted.