> ## Documentation Index > Fetch the complete documentation index at: https://docs.exclusivo.one/llms.txt > Use this file to discover all available pages before exploring further. # Customers > Customer records, segments, and who's actually on your mailing list. **Orders & customers → Customers.** Everything you know about a buyer in one place: their orders, their details, what they've spent, and whether they've agreed to hear from you. ## Buying from you isn't subscribing Someone who's bought from you is **not** on your marketing list unless they said yes. We check that at the moment we send, not when a campaign was queued — so somebody who unsubscribes today won't get an email you scheduled last week. And if we can't establish whether they're subscribed, we don't send. Missing an email is fixable; mailing someone who opted out is a complaint. Unsubscribed records stick around as your suppression list. They don't count toward your contact limit. ## Segments Group customers up for targeting — who gets a campaign, or who an automation applies to. ## Your own fields Add properties that matter to your shop — wholesale tier, preferred size, how they found you — and use them in segments and in email. ## It's your data Customer records belong to your shop. They aren't shared with other shops on the platform and they aren't pooled into some cross-shop profile. ## Through the API Available with the `customers:read` and `customers:write` scopes. A key with `customers:read` can read your customers' personal details. Keep it on your server, give it the narrowest scopes that do the job, and replace it if it's ever been somewhere public. → [Customers API](/api/store/customers) ## Related Campaigns, templates and getting your mail delivered. Welcomes, post-purchase notes, win-backs.