LONDON (Reuters) - Mastercard is among five companies which broke the law for cartel behaviour when offering pre-paid cards to vulnerable members of society, Britain’s Payment Systems Regulator said on Wednesday. Mastercard, allpay, APS, PFS and Sulion agreed not to compete or poach each other’s customers on cards used by local authorities for welfare payments including to the homeless, victims of domestic violence and asylum seekers, the PSR said. The investigation is ongoing and the companies can make representations on the provisional findings, the PSR said. Mastercard, allpay and PFS have admitted liability, and if the regulator ultimately concludes there is wrongdoing have agreed to pay maximum fines totalling more than 32 million pounds ($44 million), the watchdog said. The PSR alleges two infringements of Britain’s 1998 competition law. One breach took place over six years between 2012 and 2018 and involved all five firms, the PSR said. The other lasted between 2014 and 2016 and involved APS and FPS, the watchdog said. “Pre-paid card services, like these, can provide significant benefits to local authorities as one way to make welfare payments to some of the most vulnerable people in society,” said Chris Hemsley, managing director of the PSR. “By colluding in this way, we consider the parties were acting as a cartel... Collusion in payments is absolutely unacceptable. Where we see it happening, we will take action, stop it, and seek to impose significant penalties.” Mastercard said it took the issue very seriously and had put further controls and training in place, adding the incident was isolated to UK prepaid cards. “We apologise that the actions of two former employees resulted in the standards expected of us not being met in this instance,” a Mastercard spokesman said. Allpay said it accepted the PSR’s decision, adding it had immediately informed the regulator after it became aware of potential breaches and had cooperated fully with the investigation. Australia’s EML, which bought PFS in 2019, said it had worked collaboratively with the regulator to resolve the issue and arrangements were already in place for PFS’s previous owners to cover the cost of its around 920,000 pound fine. APS was not immediately available for comment. Sulion could not be reached.