[<reference> exchange token pin authorization]-> [<input> Please enter your PIN]
[Please enter your PIN]-> [<choice> is authorized]
[is authorized]-> yes [<reference> exchange token confirmation]
[is authorized]-> no [<choice> is blocked]
[is blocked]-> yes [<label> exit pin blocked]
[is blocked]-> no [increase failed attempts]
[increase failed attempts]-> [Please enter your PIN]