Hello I'm a software engineer with experience with c and c++, it is very strange you need to connect to the api using c or c++, that means to connect to the customer api must be done with sockets, it will be nice to know what operating system it is, if it is for windows or linux, and what it is the programming language of the code application, if it is php or another language, because to connect to the api maybe it could be done using php sockets or python sockets, without use the c or c++, all of this it depends of the specifications, of course.