Here are the few points as per your dropshipping business -
a) First of all to accept the payments you need the Payment gateway on your website so if you go with the paypal india or any international payment gateway, they required the documents.
so you have to just register your company with the new gst registration 4 under the export & open a current bank account.
b) Now if you are doing simply dropshipping but you can charge the commission as mediator from the sellers so if sellers are from India then you have to charge the GST.
c) if your sellers are listed on the aliexpress and you directly order throughout them then its not proper dropshipping. because dropshipping is like where you contact directly to the sellers.
So Ultimate GST is charge only on the commission from sellers in case of drop shipping business if sellers are from India. Hope now your points has been cleared.
Note - Remember once you opt GST Registration then you have to follow regular legal compliance like GST Return Filings 3 etc.
THANKS