Noida-headquartered digital payments company Paytm has strengthened its travel business with the acquisition of Noida-based last-minute hotel booking app, NightStay for an undisclosed amount. The confirmation of acquisition comes nearly six months after reports surfaced thatPaytm may acquire NightStay for $20 Mn (INR 142 Cr). After the acquisition, NightStay founder Nasr Khan will lead the hotel-booking services at Paytm. NightStay: Why …