[Payments] Stripe Integration MVP

[Olshansk]

Objective

Integrate with Stripe to bill users (in fiat) based on how many relays they sent.

Origin Document

The following two tickets

• [Umbrella Ticket] Rate Limiting - Capacity & Throughput Rate Limiting #10
• [Umbrella Ticket] PATH User Database  #11

Goals

• Enable any gateway operators to have a stripe payments solution out-of-the-box

Deliverables

• Implementation that integrates with stripe that involves:
  • Billing users on a monthly basis based on the number of relays sent
  • Parity with how Grove's portal works today (i.e. free plan + $2/1M plan)
• Documentation
  • Updated tooling and documentation (env variables, hooks, etc) of how to test & develop locally
  • 1-2 pager design doc (to be turned in 🦖 docs in the future) on how the system works

Non-goals / Non-deliverables

• Crypto payments
• Integrations with payment processors other than stripe
• General purpose configuration for payment plans that Grove does not offer

General deliverables

• Comments: Add/update TODOs and comments alongside the source code so it is easier to follow.
• Testing: Add new tests (unit and/or E2E) to the test suite.
• Makefile: Add new targets to the Makefile to make the new functionality easier to use.
• Documentation: Update architectural or development READMEs; use mermaid diagrams where appropriate.

---

Creator: @Olshansk
Co-Owners: @commoddity @fredteumer

[fredteumer]

Per discussions today, we are tracking this internally here: https://www.notion.so/buildwithgrove/PATH-Billing-1e5a36edfff68001b8decb3084de821b#1e5a36edfff68034924efe3b3ed69e21

This issue may be able to be closed out once we confirm the order of operations on the ELTs