> ## Documentation Index
> Fetch the complete documentation index at: https://docs.scan.com/llms.txt
> Use this file to discover all available pages before exploring further.

# FAQs

> Short answers and links into the right guide

Use this page to quickly find answers and jump into the right guide.

## Product

**What am I integrating — a marketplace or fulfillment?**
Managed imaging fulfillment. You own checkout and the member experience; Scan
books and delivers the report. You are not embedding an imaging marketplace.
See [Introduction](/introduction) and
[Is this API right for you?](/guides/build-an-imaging-experience).

**Who charges the member?**
You. The displayed amount is your price, not a Scan checkout amount.

**Is there a price, quote, or live-availability API?**
No. Contracted terms plus your checkout plus Scan-managed scheduling. Nearby
centers (`GET /locations`) apply to an existing referral, not a public search.
Invoices are post-scan, not a quote.

## Authentication

**How do I authenticate with the API?**
Send `Authorization: Bearer <api_token>` on every request. Sandbox tokens come
from Get API keys. See [Authentication](/authentication).

**What base URL should I use?**
Sandbox is `https://api.staging.scan.com` with path prefix `/api/v2`. Production
is `https://api.scan.com` with the same `/api/v2` prefix. Details are on
[Authentication](/authentication#environments).

**What if the token is lost or exposed?**
It is shown once and cannot be recovered. Contact
[api@scan.com](mailto:api@scan.com) to revoke it and issue a replacement. Never
put it in browser code, URLs, logs, or chat.

## Referrals and scheduling

**How do I send a patient and physician order?**
Follow [Submit a medical referral](/guides/submit-a-medical-referral).

**How do I send safety answers on an existing referral?**
Follow [Submit medical questions](/guides/submit-medical-questions).

**How do I send preferred times on an existing referral?**
Follow [Submit preferred times](/guides/submit-preferred-times).

**Can Scan automatically choose and book the closest or soonest opening?**
Yes, when auto-book is enabled for your account. Follow
[Submit a booking](/guides/submit-a-booking). The call returns `202`; completion
arrives at the request webhook URL, then the account webhook URL, or by polling.

**How do I send the order, safety answers, and preferred center together?**
Follow [Submit for scheduling](/guides/submit-for-scheduling).

**Do I pick a timeslot myself?**
No. Scan books from the preference you send.

## Lines of business

**I am a workers' compensation payer or TPA. Which guide?**
[Workers' compensation and payers](/guides/lines-of-business/workers-comp-and-payers).

**I am an employer or benefit team. Which guide?**
[Employers and benefit teams](/guides/lines-of-business/employers-and-benefit-teams).

**I am a health plan. Which guide?**
[Health plans](/guides/lines-of-business/health-plans). `POST /api/v2/referrals`
does not set `line_of_business: health_plan` today; that page covers how those
referrals appear on GET and webhooks.

## Sandbox and testing

**What are the sandbox limits?**
2,000 successful requests or 7 days. `4xx`/`5xx` do not count. See
[Errors and limits](/guides/errors#limits) and
[Testing](/guides/testing-and-sandbox).

## Troubleshooting

**I’m getting 401 / 403 / 422.**
See [Errors and limits](/guides/errors). Include `X-Request-Id` when you email
[api@scan.com](mailto:api@scan.com).

**Where is the full API contract?**
[API tools](/guides/api-tools) and the API reference tab.

## Webhooks

**How do visit status events work?**
See [Webhooks](/guides/webhooks) and [Track referral status](/guides/track-referral-status).

**Which statuses should I handle?**
Key off `booked`, `report_uploaded`, and `sent_to_rp`. Full list:
[Track referral status](/guides/track-referral-status).

If you do not see your question here, email [api@scan.com](mailto:api@scan.com).