Did Saint Paul perform any miracles?

Miracles were not required for declaring a person a saint in the early
years of Chrisitianity. The person would have been declared a saint by
popular acclamation to a bishop based on the lives and merits of the
candidate. This was especially true if the person died the death of a
martyr as it was felt that making this ultimate sacrifice for Our Lord
would be an automatic designation of that person as a saint.

Even today, miracles are not always a requirement for canonization,
especially in the case of martyrs.