Show a store's reservations in your own calendar
Fetch the next 7 days of a store's reservations with the Reservations API and write them to an iCalendar (.ics) file with Node.js.
Webhook overview
Which webhook events are actually sent, what the request and signature headers look like, how duplicates, order and lost events behave, and when to use the API.
Error codes and retry guidance
The status codes and error body shapes the ReceiptRoller API returns, token endpoint errors, and which failures to retry and how.
Using the Reservations API
How to read, create, change, move and update the status of reservations, generate slots, and read menus, settings, tables and monthly counts.
Webhook is not being delivered
When a webhook does not arrive: narrow it down with a test send and the delivery log, then check the active flag, subscribed events, connection and signature.
Using the Transactions API (POS + OMS unified feed)
ReceiptRoller's Transactions API is a read-only API that unifies register sales (PosTransactions) and order-management orders (OmsOrders) into a single feed. It is the entry point for showing "all of a business account's transactions" as a list in an Android / iOS app.
Using the Sales API
An overview of ReceiptRoller's Sales API (/api/v1/sales/*) and how to filter by business account, store, POS terminal, and period. A getting-started guide covering the actual response structure (the KpiValue nested type) through averageTicket and the 8-hour token lifetime, for building a sales dashboard in an Android/iOS mobile app or server integration.
Setting the redirect URL
The role of the single redirect URI on a developer app, the exact-match rule, separating environments, changing it, and common errors.
Cannot obtain a token (authentication error)
How to narrow down a 400 or 401 from the token endpoint, with the fix for each error and error_description, including invalid_client and invalid_grant.
Connect an AI agent to ReceiptRoller over MCP
Connect Claude as an MCP connector, then build your own MCP client with dynamic client registration, PKCE and JSON-RPC calls over HTTP.
Designing resends, ordering, and idempotency
What counts as success, the retry rules (1 min, 10 min, 1 h, four attempts), ordering and lost events, and dropping duplicates by X-RR-Delivery.
Rate limiting and throttling
Which ReceiptRoller API endpoints limit requests and by how much, what a 429 looks like, and how to pace and retry your client's calls.
Monitoring and handling failures
Read a webhook's active flag, last delivery time and delivery log, notice when it has switched itself off, recover, and fill the gap from the API.
Account linking and merging API (token exchange, /me/identities, /account/merge)
How native apps and the LINE mini app sign in with a LINE, Apple or Google ID token, add and remove sign-in methods, and merge two accounts — the endpoints, the proof object and the error codes.
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.
Purchase and receipt data integration
Explains the structure of the purchase and receipt data ReceiptRoller handles, how to retrieve it, related scopes, Webhooks, and common use cases.
PosTransactionDto specification — field reference for transaction data
A complete field reference for PosTransactionDto, the canonical model for the transaction data ReceiptRoller handles. For each category — identifiers, dates, amounts, line items, payments, staff, status, and CRM linkage — it summarizes the field names, types, meanings, and how each POS vendor populates them. A reference for developers and external-system integrators. Also referenced from the Smaregi and Square mapping articles.