For some Sis ID verifications, a micro deposit or penny drop is used. This kind of bank account verification is a very small test payment sent to confirm the account is valid and accessible.
It result in a payment of generally 0,01€ to the beneficiary bank account, visible on the bank statement on your third party
No action is required from the payment beneficiary
When the payment reason is displayed by the receiving bank, it may include a explanatory mention.