Tiendas de raya
The tienda de raya of the Hacienda El Roble, Guanajuato
On 24 March 1907 someone wrote to El Diario that a leading public servant had introduced the notorious fichas into their tienda de raya, and the practice had spread from the district of Ciudad Gonzalez to others, principally IrapuatoEl Diario, II, Núm. 137, 26 March 1907.
However, tiendas were more likely to use book-keeping or metal fichas than anything that can be defined as paper money, so we need to await actual examples.