Licensing and authorization creteria for customs brokers are publicly available, see guidelines published by the licensing authority (Consiglio Nazionale degli Spedizionieri Doganali): https://www.cnsd.it/professione/accesso-alla-professione. Note that customs related logistic services are the only ones for which a license is required (see STRI measures 1_21_1 and 2_25_1) 