403/401 is returned (permissions and scopes)
How to isolate the cause when an API call returns 401 or 403. Explains the typical cases: invalid token, insufficient scope, no store access permission, and User-scope review not passed.
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.
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.
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.
Obtaining and refreshing an access token
How to obtain and refresh access tokens (8 hours) and refresh tokens (30 days), how refresh tokens rotate, and when tokens stop working.
Signature verification and security
How X-RR-Signature is computed, verification code for Node.js, Python and C#, guarding against replays, and how to replace a webhook secret.
Your first API call: from app registration to listing transactions
Get a token with the OAuth authorization code flow and PKCE, confirm the business account, list its transactions, and refresh the token.
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.
Receive new sales by webhook and post them to Slack
Register a receipt.created webhook, verify its signature and drop duplicates in Node.js, and post each new sale to a Slack channel.
Sync your product catalogue with ReceiptRoller
Build a Node.js script that reads a local CSV or JSON file, matches products by SKU, and creates or patches them through the Products API.
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.
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.
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.
API Authentication Guide
How to authenticate with the OAuth 2.0 authorization code flow: authorize parameters, the consent screen, token exchange and revocation, errors and scopes.
Managing the client ID and client secret
Where to find the client ID and client secret, how to store them, regenerating the secret after a suspected leak, and running several environments.
Using the Products API
How to list, read, create, patch, replace, soft-delete and upload cover images for products with the Products API (/api/v1/products), with exact field names.
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.
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.
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.
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.