Lets understand payment system in detail

1. -
- Explained by OmVikramThapa

2. CAN WE
RELATE
THEM?

3. DISCLAIMER
“THIS SESSION IS NOT ABOUT
HOW TO BUILD A PG BUT
ABOUT HOW THE PG & ITS
SURROUNDING SYSTEM
WORKS!!”

4. ● CLIENT == MERCHANT
● PAYMENT INSTRUMENTS
● DIRECT PG == BANK PG
● PG AGGREGATOR
● CARD PROCESSOR
● PAYMENT PROCESSOR
● ISSUER BANK
--------------------------------
● SEAMLESS/NON-SEAMLESS
● INLINE/EXPRESS
● PAYMENT SUCCESS RATE
SLANGS

5. ● MERCHANT ID
● SALT OR CHECKSUM
● ENCRYPTION LOGIC
● REDIRECT URL
● SURL
● FURL
● CURL
● PAYMENT STATUS API
● REFUND API
● CALLBACK API
● WHITELISTING
SANDBOX

6. WHAT ARE THE MOST IMPORTANT
THINGS A PAYMENT GATEWAY
REQUIRES TO COMPLETE A
PAYMENT FOR A PRODUCT?
PAYMENT
PAGE
QUERY

7. THE
ANSWER IS
● ROTI == ORDER OBJECT
● KAPDA == CUSTOMER OBJECT
● MAKAAN == PAYMENT OBJECT

8. ● CC
● DC
● NB
● WALLET
● UPI
● PAY LATER
- PRE-DECIDED PG IN BAKGROUND
- SERVES BANK CODE FOR NB
- SERVES BANK DOWNTIME NOTIFN.
- CHECKS USER SAVED CARD INFO
- CHECKS ELIGIBILITY CRITERIA
1
GET PAYMENT
INSTRUMENTS

9. ● CLIENT SIDE
JUSPAY, BRAINTREE
● SERVER SIDE
PAYU, CCAVENUE, BILLDESK
2
INTEGRATE

10. CLIENT
SIDE INTEG.

11. SERVER
SIDE INTEG.

12. EXAMPLES
SHA(order_id|order_amount|customer_email|custome
r_phone|.......|SALT) ==> HASH
MD5(order_id~order_amount~customer_email~custo
mer_phone~SALT~customer_phone~customer_email
~order_amount~order_id) ==> HASH
OUTPUT = UNIQUETARGET URL

13. 3
PAYMENT
GATEWAY
CLIENT SIDE
- FORM SUBMITTOTARGET URL
(MERCHANT LOOSE CONTROL HERE)
SERVER SIDE
- FORM SUBMIT FROM SERVER SIDE
- AUTH & CAPTURE APIs
(MERCHANT HAS SOME CONTROL HERE)

14. IT’S NOT
DONEYET...

15. 4
BANK PG :
ACTUAL
PAYMENT
PROCESSOR

16. 5
REVERSE
U-TURN
⚫ MERCHANT
ORDER ID
⚫ PGTXN ID
⚫ BANK
REFERENCE NO
⚫ BANK
REFERENCE NO
⚫ PGTXN ID
⚫ MERCHANT
ORDER ID

17. 6
REDIRECTION

18. 7
SERVER SIDE
VERIFY CALL
MOST OFTHE PGs PROVIDETHIS S2S CALLTO CROSSVERIFY
THE PAYMENT.THIS ISTO AVOID RISK & PASS UDFVALUES.

19. MEDIUM
BLOGS
https://omvikram.medium.com/10-simple-tips-to-keep-a-check-on-
payment-success-rate-bb2802df3a03
https://omvikram.medium.com/payment-system-in-india-part-2-3f
426c15c9c1
https://omvikram.medium.com/inline-vs-express-checkout-ed265a
b6013b
https://omvikram.medium.com/bin-based-routing-in-payment-816e
4cdaf4f3
https://omvikram.medium.com/welcome-offline-payments-fb632a8
85cd9

20. “THANKYOU
QUOTE”