Sorry for not being able to share information about WPT since it's restricted in my jurisdiction , but usually someone from their support can tell you exactly what you need for proof of ID. they might need a jpg of ID or driving licence , maybe a utility bil or bank statement , not older than 3 months.
And why I write this reply is because some support staff ask for front and back photo of your credit card .... NEVER SHARE that information , since support might be outsorced by an external company and you dont want a random employee knowing sensitive information such as your credit card CVV
Have you guys had instances when support ask for credit card photos front and back ?