bank certificate with 50,000 php amount as requirement

For business visa application, the bank certificate with 50,000 pesos is not required, the original invitation letter from an authorized unit is the most important document for your business trip to teach in an International Kindergarten school. I guess that the travel agency asks you to provide it because he is afraid that you won't pay for the service fee if the application is denied.

You can apply for business visa to China in person if you don't want to provide the bank certificate with 50,000 php amount