include(FetchContent)
FetchContent_Declare(
  markpdf-cpp
  GIT_REPOSITORY https://github.com/markpdf/markpdf-cpp.git
  GIT_TAG        v1.0.0
)
FetchContent_MakeAvailable(markpdf-cpp)

target_link_libraries(tu_app PRIVATE markpdf::markpdf)

vcpkg install markpdf-cpp

find_package(markpdf-cpp CONFIG REQUIRED)
target_link_libraries(tu_app PRIVATE markpdf::markpdf)

[requires]
markpdf-cpp/1.0.0

[generators]
CMakeDeps
CMakeToolchain

#include <markpdf/client.hpp>
#include <cstdlib>

int main() {
    // From environment variable MARKPDF_API_KEY
    markpdf::Client client;

    // Or explicit
    markpdf::Client client2("YOUR_API_KEY");
}