Following the European Banking Authority’s clarification that, in order to meet dynamic linking requirements, the final authorised amount of a transaction cannot be higher than the originally authenticated amount, Visa made the following changes within the European Economic Areas (EEA):
- Removed authorisation tolerance limits that allowed merchants to clear an amount greater than the authorised amount (for example, adding up to 20% when a gratuity is applied).
- Allowing all eCommerce merchants in the EEA to use pre-authorisations in the event that the final transaction amount is anticipated to differ from the initial authorised and authenticated amount. Historically this function was only available to customers in the Travel & Entertainment (T&E) sectors.
In the UK, all eCommerce merchants will be extended the permission to use estimated authorisations where applicable, from 17 October 2021.
Discussions are underway with the UK Financial Conduct Authority regarding a reasonable variation to authorisation amounts in the UK. Until those discussions conclude, UK customers are still permitted to clear up to 15% greater than the authenticated amount.
If you’re a T&E customer, you’ll be well versed already on the use of pre-authorisations. If you are not, Elavon would like to share some basic considerations if you’re considering their use:
Handling amount variations when cardholder can no longer authenticate.
You have two options when dealing with an unknown final transaction amount in a Cardholder Initiated Transaction (CIT) where the final amount increases due to circumstances not initiated by the cardholder:
Option 1: Perform a Merchant Initiated Transaction (MIT) incremental authorisation (preferred)
When you know that a final amount may vary and the cardholder is no longer available to authenticate the increase, you can process the initial authorisation with the “known” amount at check-out and add an additional unauthenticated authorisation amount as an MIT (submit the transaction in two parts, the initial CIT pre-authorisation and an MIT top-up)
Option 2: Perform initial authentication for the highest estimated amount
When you perform the initial pre-authorisation, authenticate for the highest possible estimated amount that would cover any anticipated amount variation.
This option may cause customer confusion or cart abandonment if the cardholder is unclear why they are being asked to authenticate for a higher amount than the checkout value of the goods or services, so it is essential that if you’re pursuing this option you clearly communicate to the customer, prior to authentication, that:
- They are being authenticated for a maximum authorisation amount.
- They will only be charged for what they purchase (which may be lower than the authenticated amount) and for any other relevant charges not yet known (e.g. shipping and taxes).
- No charges will appear on their card statement until the order is finalised.
Option 2 relies heavily on your ability to generate an electronic reversal message, along with the clearing message. While the clearing message advises the Issuer of the exact final amount, the reversal message is needed to release the remaining part of the reserved funds. Without this, the funds can remain reserved indefinitely, causing cardholder frustration.
SCA considerations
Under PSD2 Strong Customer Authentication (SCA) rules, an exemption may apply to some transactions under Option 2 above, where exemption qualification criteria are met.
For transactions where SCA is applied, you cannot simply process an additional authorisation or top-up without the customer initiating a new transaction—even if a transaction for the additional amount would qualify for an exemption—because exemptions can only be applied to CITs.
MITs cannot be processed without prior customer consent and authentication. Upon contacting the cardholder, you have the choice to:
- Authenticate for the new total final amount and submit one final authorisation with this amount (exemptions can be used if applicable), in which case any initial authorisation prior to this must be reversed in full, or
- Authenticate only for the additional amount (exemptions can be used if applicable) and submit two authorisations, for the initial amount and the additional amount, each with their respective authentication value or exemptions indicators, as applicable.