PayLater in India
As we can see the name of service is Pay Later , it's work is also same as its name . 
It means Use Now & Pay Later most of time it's intrest free service.
So you need to clear due either in 1st week* of months or also 3rd week** depends on PayLater companies .
ЁЯСЙ * 1st Week may be as 1st - 5th dates of month only .
ЁЯСЙ ** 3rd week may be as 16th-20th date of month .
Some PayLater allow you to pay anywhere like nearby small shops too & some allow you to pay only online site .
Few Pay Later company give you option to convert your due payment in EMI.
In India there are several PayLater companies along with some international company too .
Eligibility & Document Required :
ЁЯСЙ You must be an Indian citizen.
ЁЯСЙ 18+ or 21+ or 23+ age depend on Lander company
ЁЯСЙ Must have AADHAR card linked with working SIM for OTP
ЁЯСЙ PAN CARD Must be there
ЁЯСЙ There's full online process so no need to submit any scan copy .
ЁЯСЙ NACH is optional for most of case.
‡ Your clear bill on time impacts Positive on CIBIL SCORE ( Credit Score) So due clear before last day of due date .
Here is Some Important PayLater where you can enroll :
1. Amazon Pay Later ( EMI also).
2. Flipkart Pay Later
3. PayTm PostPaid { Pay Later}
4. Lazy Pay Later
5. Freo Pay Later ( chillPay Later)
6. Bullet Pay Later
7. FreeCharge Pay Later
8. Simpl Pay Later
9. Mobikwik Zip ( Pay Later)
10. PostPe Pay Later ( early access)
11. Slice
12. True Balance Pay Later
13. Uni Card
Etc
International cum India operational Pay Later:
1. Sezzle Pay Later
2. Hoolah Pay Later
Etc .