Point of Sale setup guides for POS bundle:
Hardware Setup Guide:
https://dl.waspbarcode.com/kb/pos/pos_hardware_setup_guide.pdf
ESC/POS FAQ: printer commands:
https://dl.waspbarcode.com/kb/pos/esc-pos_commands_faqs.pdf
WRP8055 Thermal Receipt Printer manual (also applies to other receipt printer models):
https://dl.waspbarcode.com/kb/pos/receipt-printer-user-manual.pdf