Dependency Inversion Principle Explained: SOLID with Dependency Injection

[PSA! To all Filipino and Foreign Travelers in and out of Philippines] Disclaimer: This is still an implementation but news have been spreading about the additional charge of 480 Php Round Trip (240 php One-way) for Added Advacne Border Security System according to the Bureau of Immigration On top of the 1620-2700 Php of Travel Tax na hindi pa na-aabolish ng House of Senate and President, here we are again for another additional payment just for the sake to go our of the country Here is everythi