MerchantSessionId Property
Your customer session identification token.
Syntax
[VB.NET] Public Property MerchantSessionId As String
[C#] public string MerchantSessionId {get; set;}
Remarks
PayPal records this optional session identification token as an additional means to detect possible fraud.
This property is optional.
Character length and limitations: 64 single-byte numeric characters.
Default Value
""