Need a POS Bill generating website for my Internet Cyber Café Business

I need a POS Billing website for my Internet Cyber Café Business Items I sell are, Hourly Internet, Black&White Printouts, Scanning, DTP Job Work, And Many Other hundred Items ? The online billing Application will generate bills for every transactions and to be printed in POS Thermal Printer and also generate hourly/Daily/ Weakly/ Monthly Sale Data in PDF and Excel. ? Admin can add at least 100-150 items and services for sale in the store. ? The online Billing application must be able to open and generate 15-20 Transactions at one time all separately. This is mostly because there shall be 10-12 different users already sitting/using different terminals/computers. Admin can keep on adding items they keep on purchasing to the bill. ? Each Bill generate must have Name/ Mobile No/ Membership No (If any) on the bill header. ? The Billing Application Must Have 5-10 Additional Items whose price will be blank and can be added manually through keyboard on the bill. ? Admin can change/Modify/View/ Delete any items at any time when required. ? The Online Billing application must have an option either to print or export pdf or both for every bill generated after transactions.