Pick the source you already have. Every source feeds the same database, with the same consent trail and the same suppression list.
The cleanest source: a person types their own address and ticks the consent box. Embed the code on your site or link the hosted page from social media and QR codes.
One required column: email. Unknown columns become custom fields, so nothing is lost. Re-importing merges data instead of creating duplicates.
A user with webapi access in the shop admin. We pull customers from orders — including those who bought without creating an account.
REST API keys with read-only permission. We take completed orders, with the address and the data used for personalisation.
A token from the API section. A good fit when you sell across several channels — BaseLinker gathers them in one place and we gather customers from it.
Add a contact with a single POST call and an API key. A separate call reports an event (an abandoned cart, for example) that starts an automation flow.
Importing contacts takes a minute, building the message a few more. 14 days free, no card required.
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