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📶 Telecom · Sequence

Prepaid Recharge Sequence

What happens when a customer recharges a prepaid mobile: plan selection, payment, balance update in the charging system and confirmation.

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Drawing diagram…

What this diagram shows

  • Payment is confirmed before any balance is added
  • The online charging system applies the plan instantly
  • Failed recharges are refunded automatically

Prompt used

Prepaid recharge sequence: the customer picks a plan in the operator's app, pays via UPI through the payment gateway, the recharge service receives payment confirmation, calls the online charging system to apply the plan (data, validity, calls), the OCS confirms, and the customer gets an SMS with the new balance and validity. If the OCS fails, the recharge is retried and then refunded.

Mermaid code
sequenceDiagram
  actor C as Customer
  participant App as Operator App
  participant PG as Payment Gateway
  participant RS as Recharge Service
  participant OCS as Online Charging System
  participant SMS as SMS Centre
  C->>App: Select Rs 299 plan
  App->>PG: Pay by UPI
  PG-->>RS: Payment confirmed
  RS->>OCS: Apply plan (2 GB/day, 28 days)
  alt Applied
    OCS-->>RS: Balance updated
    RS->>SMS: Send confirmation
    SMS-->>C: Plan active till 24 Oct
  else Failed
    OCS-->>RS: Error
    RS->>OCS: Retry
    RS->>PG: Refund if still failing
  end

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