i am developing php websites for last one and half year in the company. Now i got some work as a freelancer...... my client want me to develop the site exact like http://www.yatra.com, http://www.makemytrip.com (travel portal website where the users can book online airtickets, railway tickets, hotels etc)... i know that i can develop the site but i am stuck only in how the airlines, railway, hotels give permissions to access their databases to check which seat/flight is available, which room is available......
if anybody regarding this know anything please do reply me
thnaks in advance