How would you deal with customers offering suspect tender or suspect non cash payments?

To address customers offering suspect tender or non-cash payments, I would first politely request additional identification or information to verify the transaction. If the payment remains questionable, I would explain the company's policy on acceptable payment methods and decline the transaction if necessary. It's essential to remain calm and professional, ensuring the customer understands the reason for the refusal while emphasizing the importance of security and compliance. Additionally, I would document the incident for future reference and reporting.