Paymaxx Customer Login Paymaxx Pro Merchant Portal This login is for the merchant portal for Paymaxx Pro merchants. We are excited to announce that Paymaxx Pro has joined REPAY – Realtime Electronic Payments to offer you a better payment experience and more advanced technology. Rest assured, the wonderful Paymaxx team members are still here, they have just joined the REPAY family. We are now making it official by transitioning the website and all technology platforms to the REPAY brand. If you need any assistance, please contact REPAY Customer Service at 877.607.5468 or customerservice@repay.com. Login Password Paymaxx Pro is a registered ISO/MSP of Fifth Third Bank, 38 Fountain Square Plaza, Cincinnati, OH 45263