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The short answer: in your own system, record for each customer which kinds of notice they want by SMS, when they agreed and in which language. Essential service notices stay on; optional reminders and marketing are the customer's choice. For anyone who wants no SMS at all, there is the opt-out list in our API.
Three levels of notice
| Level | Examples | Can they switch it off? |
| Essential | Account security, payment received, service suspended | Usually not; say so in your terms |
| Useful reminders | Appointment tomorrow, invoice due, order on its way | Yes, one switch per type |
| Marketing | Promotions, news, campaigns | Yes, and only with explicit consent |
What to store in your system
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Before each send, your system checks these choices. It is simpler than it sounds: a table with the customer, the notice type and a yes or no.
When the customer wants no SMS at all
Add the number to the account's list with POST /v1/sms/opt-outs. From then on, any send to it is refused with number_opted_out, even if someone makes a mistake. GET /v1/sms/opt-outs shows the list, and the number parameter checks a single number. On the SMS page in Meu MozOut, anyone on the list is left out of sends.
| The list means "never again". Taking a number off it requires contacting support. So a customer who only wants to stop reminders or marketing is flagged in your system, not on the list. |
| Since SMS cannot receive replies, say in each optional notice how to stop it: the preferences page on your website, a phone number or an e-mail address. The general rules are in SMS good practices and consent. |
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Want notices customers appreciate rather than block? See the API page. See the API page |
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