Document Subscription Contract API with authentication and endpointsFrank35950:patch-1 #362

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	- [PiRC1: Pi Ecosystem Token Design](./PiRC1/ReadMe.md)
	- [PiRC2: Subscription Contract API](./PiRC2/ReadMe.md)
	# 📘 Subscription Contract API

	## Overview
	The Subscription Contract API enables applications to manage recurring billing agreements between service providers and customers. It supports creating, updating, retrieving, and canceling subscription contracts.

	---

	## Authentication
	- API Key: Include in request headers (`Authorization: Bearer <token>`).
	- OAuth 2.0: For secure delegated access.

	---

	## Endpoints

	\| Endpoint \| Method \| Description \|
	\|---------------------\|--------\|------------------------------\|
	\| `/contracts` \| POST \| Create a new subscription \|
	\| `/contracts/{id}` \| GET \| Retrieve contract details \|
	\| `/contracts/{id}` \| PUT \| Update contract terms \|
	\| `/contracts/{id}` \| DELETE \| Cancel a subscription \|

	---

	## Data Models

	### Contract Object
	```json
	{
	"id": "sub_12345",
	"customer_id": "cust_67890",
	"plan_id": "plan_basic",
	"status": "active",
	"start_date": "2026年04月27日",
	"renewal_date": "2026年05月27日",
	"billing_cycle": "monthly"
	}- [PiRC1: Pi Ecosystem Token Design](./PiRC1/ReadMe.md)
	- [PiRC2: Subscription Contract API](./PiRC2/ReadMe.md)

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