I am wondering about how can I send and get data from my PHP scripts securely, I have two PHP files one in my personal server and the other on different server (customer server), I want to send and received data from my server one to customer server one that do a job which could print "test" on web page.
How can I make sure that I am the only one who could make the requests to the PHP file in customer server, and how can I send and received the data securely (encrypted) which I am the only one who can decrypt the data even if the customer open the PHP file in his server then he won't be able to decrypt any data?
Are there any suggestions to do these jobs securely ? will be grateful for your answers.
Thanks in advance.