API Authentication Guide
Explains how to authenticate with the ReceiptRoller API using the OAuth 2.0 authorization code flow.
Cannot obtain a token (authentication error)
How to isolate the cause when you cannot obtain an access token. Explains the representative errors — invalid_client, invalid_grant, redirect_uri_mismatch — and what to do about them.
Developer Help Index
The index of ReceiptRoller developer help. Covers the developer application, app registration, OAuth authentication and scopes, implementation guides (wallet apps, store-facing Webhooks, the Survey API), guides by data domain, operations and security, the community, and troubleshooting.
Wallet App: Guide to Fetching a User's Receipts via OAuth
Explains how to fetch a user's Receipt Roller purchase receipts, with their consent, from a wallet-style app such as iOS, Android, or a LINE Mini App. Covers OAuth 2.0 authentication, the receipts API, and Webhook integration.
Using the Store App Content API (News, Pages, and Business Info)
A guide to /api/v1/apps/{shopId}/*, used to fetch store app content (news, pages, app manifest, business info, and membership card config). Explains that shopId is the same as the business account ID, the difference between business-account-level content and store-level content, and how authentication is handled.