People who come to Tijuana from China say it is difficult to enter the customs. Is it true?/You don't say.

1. There must be a traffic sign. Passports from Mexico to China could have been visa-free in transit, but since direct flights from Shanghai to Mexico City require stopovers in Tijuana or los cabos, transit visas are required (because Tijuana or los cabos are domestic flights in Mexico). It is impossible without a transit visa. And the visa has nothing to do with customs. The customs does not check people, but the border inspection department (that is, the immigration bureau) checks your passport and visa. Your Mexican visa has expired, so you can't! The visa expires. You must obtain a valid Mexican transit visa and you must transit Mexico within the validity period.

2. No problem, it is no problem to return to China, as long as you can leave Cuba within the effective stay period. You come from China. As long as your China passport has not expired, you will not be refused entry.

It should be no problem for you to bring thousands of euros. There is no handling fee for swiping the card, only cash withdrawal is accepted. The credit card will only charge you according to the exchange rate of the day (unless the bank specifically indicates that there is a handling fee in consumption abroad when you apply for the card).