What is the payment method for Nexo?

Could you elaborate on the payment methods available for Nexo? I'm particularly interested in understanding if Nexo supports traditional fiat currencies or if it's strictly a cryptocurrency-based platform. Are there any specific credit cards or bank transfers that are accepted? Additionally, are there any fees associated with depositing or withdrawing funds using these payment methods? I'd appreciate a detailed overview of the payment options Nexo provides and any relevant fees or limitations that users should be aware of.