SONDA modernises Metro and MiBus fare collection with open-loop payments, Panama October 21, 2026 | Latin America News, News Metro de Panamá, S.A. and SONDA are modernising the fare collection system covering Metro de Panamá, MiBus buses, and paid zones. SONDA is the contractor responsible for implementing the updated fare ... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password