1. Billing transaction processing
Olga Soboleva
Kirill Ivanov

2. Problem Statement
Customer can:
• Top up an account
• Make calls, send text messages and use internet
• Get current balance

3. Use Case
Customer's
account
(0$)

4. Use Case
Top up: +250$
Customer's
account
(250$)

5. Use Case
SMS (1 unit): -2$
Call (5 minutes): -5$
Top up: +250$
SMS (2 units): -4$
Customer's
account
(239$)

6. Transaction Processing
transaction
Balance service

7. Transaction Processing
transaction
Balance service
Transactions

8. Transaction Processing
transaction
Balance service
async
Transactions
Transaction
handling

9. Transaction Processing
transaction
Balance service
async
Transactions
Transaction
handling
Settings

10. Transaction Processing
transaction
Balance service
async
Transactions
Transaction
handling
Settings
Charges

11. Transaction Processing
CF: Transactions

12. Transaction Processing
CF: Transactions
Row: "transactionId"
…

13. Transaction Processing
CF: Transactions
Row: "transactionId"
Col: "transactionId"
Transaction:
• transactionId
• transactionDate
• senderId
• recipientId
• resourceId
• resourceCount
…

14. Transaction Processing
Write off sample
Transaction:
• transactionId
• transactionDate
• senderId
• recipientId
• "sms"
• 3
Top up sample
Transaction:
• transactionId
• transactionDate
• customerId
• customerId
• "money"
• 250

15. Transaction Processing
CF: Charges

16. Transaction Processing
CF: Charges
Row: "customerId"
…

17. Transaction Processing
CF: Charges
Row: "customerId"
Col: "yyyy-MM-ddTHH-mm-ss-fffffff:transactionId"
Charge:
• Money
• Type (WriteOff or TopUp)
• TransactionDate
• TransactionId
…
…

18. Transaction Processing
Write off sample
Charge:
• -2$
• WriteOff
• TransactionDate
• TransactionId
Top up sample
Charge:
• +250$
• TopUp
• TransactionDate
• TransactionId

19. Problem Statement
Customer can:
• Top up an account
• Make calls, send text messages and use internet
• Get current balance

20. Get Current Balance
Charge 1
+
Charge 2
+
…
+
Charge N

21. Get Current Balance
Charge 1
+
Charge 2
+
…
+
Charge N
Balance

22. Get Current Balance
time
charges count

23. Get Current Balance
time
charges count

24. Get Current Balance
Charge N
…
Charge k+1
Charge k
…
Σ
Charge 1
Solution — aggregate balance

25. Get Current Balance
Charge N
…
Charge k+1
Charge k
last aggregation
now - Δt
now
Charge N
Σ
…
time
Charge k+1
balance set up
Charge 1
Σ
…
Solution — aggregate balance

26. Get Current Balance
CF: AggregatedBalance
Row: "customerId"
…

27. Get Current Balance
CF: AggregatedBalance
Row: "customerId"
Col: "customerId"
AggregatedBalance :
• Money
• AggregationDate
…

28. Problem Statement
Customer can:
• Top up an account
• Make calls, send text messages and use internet
• Get current balance

29. Problem Statement
Customer can:
•
•
•
•
Top up an account
Make calls, send text messages and use internet
Get current balance
Buy package of services

30. Package of Services
Charge structure
money
resource
count
resource
id
type
…

31. Package of Services
Charge structure
money
resource
count
resource
id
type
…
WriteOff
…
Example
-6$
-3
"sms"

32. Package of Services
Charge structure
money
resource
count
resource
id
type
…
Annul
…
Annul
—
—
"sms"

33. Package of Services
Charge (+10$)
Balance
• 10$

34. Package of Services
Charge (+10$)
Charge (+100 sms)
Balance
• 10$
• 100 sms

35. Package of Services
Charge (+10$)
Charge (+100 sms)
Charge (-2 sms)
Balance
• 10$
• 98 sms

36. Package of Services
Charge (+10$)
Charge (+100 sms)
Charge (-2 sms)
Charge (-5 sms)
Balance
• 10$
• 93 sms

37. Package of Services
Charge (+10$)
Charge (+100 sms)
Charge (-2 sms)
Charge (-5 sms)
Annul
Balance
• 10$

38. Package of Services
Charge (+10$)
Charge (+100 sms)
Charge (-2 sms)
Charge (-5 sms)
Annul
Charge (-3 sms)
Balance
• 4$

39. Problem Statement
Customer can:
•
•
•
•
Top up an account
Make calls, send text messages and use internet
Get current balance
Buy package of services

40. Problem Statement
Customer can:
•
•
•
•
•
Top up an account
Make calls, send text messages and use internet
Get current balance
Buy package of services
Buy flat rate

41. Flat Rate
• To all recipients
• To fixed recipients

42. Flat Rate
• To all recipients
• To fixed recipients
Settings
transaction
Transaction
handling
Not processed
Charges

43. Problem Statement
Customer can:
•
•
•
•
•
Top up an account
Make calls, send text messages and use internet
Get current balance
Buy package of services
Buy flat rate

44. Kirill Ivanov
ikp@skbkontur.ru
Olga Soboleva
olgasob@skbkontur.ru