Hello, the smaller colectivos and second class buses will not accept credit cards. The rates are so low it is just not feasible and the people who travel on these buses in general do not have credit cards. ADO and first class buses will accept credit cards at the station. Read more here:

http://yucatantoday.com/en/topics/yucatan-bus-lines-and-taxis

http://yucatantoday.com/en/topics/valladolid

http://yucatantoday.com/en/topics/cenotes-underwater-sinkholes

http://yucatantoday.com/en/topics/celestun

http://yucatantoday.com/en/topics/progreso

http://yucatantoday.com/en/topics/ek-balam