# OutboundLegal > Help for OutboundLegal customers, and the OutboundLegal API. - [Welcome](https://docs.outboundlegal.com/help/index.md): What's in the OutboundLegal Help Center, and how to reach us. - [Getting started](https://docs.outboundlegal.com/help/getting-started.md): Sign in for the first time, find your way around the home page and sidebar, and know where to get help. - [Your account and signing in](https://docs.outboundlegal.com/help/account-and-sign-in.md): Change your password or email, give a colleague access, and get back in if you're locked out. - [Counties and prospects](https://docs.outboundlegal.com/help/counties-and-prospects.md): What a county subscription gives you, how to browse and filter prospects, and what happens when a county is archived. - [Campaigns](https://docs.outboundlegal.com/help/campaigns.md): Set up campaigns that mail letters, send you spreadsheets, or sync audiences to Meta — and find the results in Reports. - [Mailing options](https://docs.outboundlegal.com/help/mailing-options.md): Who prints and mails your letters and postcards, who pays, and how to pick an option in the campaign wizard. - [Meta audiences](https://docs.outboundlegal.com/help/meta-audiences.md): Connect your firm's Facebook ad account so your campaigns can add new prospects to a custom audience for your ads. - [Your clients list](https://docs.outboundlegal.com/help/clients.md): Keep a list of your firm's own clients in OutboundLegal, so you can send them client letters. - [Client letters](https://docs.outboundlegal.com/help/client-letters.md): Send your own clients a thank-you after a case settles, a yearly letter, or a one-time announcement. Nothing mails until you approve it. - [Billing and your subscription](https://docs.outboundlegal.com/help/billing-and-your-subscription.md): When you're charged, what emails to expect, how renewal and cancellation work, and what happens if a payment fails. - [API keys](https://docs.outboundlegal.com/help/api-keys.md): Create a key so Zapier or your own tools can work with OutboundLegal. Treat it like a password. - [Frequently asked questions](https://docs.outboundlegal.com/help/faq.md): Short answers to the questions we hear most, with links to the full articles. - [Introduction](https://docs.outboundlegal.com/api/introduction.md): Connect Zapier, your case system or your own scripts to OutboundLegal. - [Connect with Zapier](https://docs.outboundlegal.com/api/zapier.md): An OutboundLegal app for Zapier is coming. - [Check your key](https://docs.outboundlegal.com/api-reference/account/check-your-key.md): Returns the account the key belongs to. Zapier uses this to test the connection. - [List clients](https://docs.outboundlegal.com/api-reference/clients/list-clients.md): Your clients, oldest change first. Keep passing `next_cursor` back as `cursor` until it's `null`. A change shows up here about a minute after it's saved. - [Add or update clients](https://docs.outboundlegal.com/api-reference/clients/add-or-update-clients.md): Adds or updates up to 500 clients. A client is found by `external_id`, otherwise by name + street address + ZIP (all three). Blank or missing fields never erase what's saved. A client who already has a different `external_id` is reported as a `conflict`, not merged. You get one result per client, in… - [Mark a case settled](https://docs.outboundlegal.com/api-reference/clients/mark-a-case-settled.md): "This client's case settled." Adds the client if they're new, otherwise updates them, and sets `settled_on` — the date a case-settled client letter waits for. Send `settled_on` plus either `external_id` (enough on its own for a client you've already sent us; add a name to create a new one) or a name… - [List prospects (cold leads)](https://docs.outboundlegal.com/api-reference/prospects/list-prospects-cold-leads.md): Crash prospects in your counties, as **cold leads**: people who have not contacted your firm. These are the same prospects you see on your Prospects pages. Needs the digital bundle. ## OpenAPI Specs - [openapi](/api/openapi.json) This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.