Enable Users To Buy Auto Drive Upload Credits

[clostao]

High-level approach

Using pallet-balances.Transfer transactions, the user creates the extrinsic, creates an invoice in auto-drive that includes information about the transaction so Auto-Drive's Payment Processor can track the payment adding the appropriate amount of credits on finalisation, and finally submits the extrinsic.

Implementation Steps:

1. Support ‘one-of’ credits granularity
2. Payment processor using simple Substrate balances.transfer
3. Callback on payment received to update upload credits

Updates in data model (minimal)

• SubscriptionGranularity: enum [one_of, monthly]
• New table invoices for keeping track of payment creations.

API/services

• POST /credits/invoices → creates invoice; returns Invoice
• GET /credits/invoices/{id} → status polling
• PaymentMonitor service:
  • Subscribes to chain, matches transfers to the treasury address, enforces finality, triggers crediting.

Chain parameters and guardrails

• Use chain decimals correctly for UI display.
• Document supported chain and SS58 prefix.
• Handle reorgs: only act on finalised blocks.

Admin panel changes

• Product/plan form: add granularity selector with one_off default.

[jfrank-summit]

This is a great start, thanks for running with this! I'm going to supplement this (probably in Notion to start) with some more high level thoughts on the problems we are trying to solve and what solutions may look like, before digging into implementation details. I should have something to share by EOD tomorrow.