You can find Instamojo's GSTIN and PAN details here:
Name:
Instamojo Research and Development Private Limited
PAN Number:
AADCI7168K
GST Number:
29AADCI7168K1ZZ
Address:
3rd floor, Maa Grace, 12, 7th Cross Road,
Koramangala 1A Block,
Bangalore - 560034, Karnataka