(14)In the case of real-time transaction risk analysis that categorise a payment transaction as low risk, it is also appropriate to introduce an exemption for the payment service provider that intends not to apply strong customer authentication through the adoption of effective and risk-based requirements which ensure the safety of the payment service user's funds and personal data. Those risk-based requirements should combine the scores of the risk analysis, confirming that no abnormal spending or behavioural pattern of the payer has been identified, taking into account other risk factors including information on the location of the payer and of the payee with monetary thresholds based on fraud rates calculated for remote payments. Where, on the basis of the real-time transaction risk analysis, a payment cannot be qualified as posing a low level of risk, the payment service provider should revert to strong customer authentication. The maximum value of such risk-based exemption should be set in a manner ensuring a very low corresponding fraud rate, also by comparison to the fraud rates of all the payment transactions of the payment service provider, including those authenticated through strong customer authentication, within a certain period of time and on a rolling basis.