Where can I find my authentication transaction code ? I can’t find and I need it

[Noorely]

Whenever I wanna do a transaction to PAYPAL , it said that I should write an number of authentication transaction but I can’t find it in PAYPAL , where I can find it ?

[kernowlass]

@Noorely 

Any security code is normally sent to the mobile phone that is linked to your paypal account.

[Noorely]

But how can I do it ?