Adding our recent experience with Klaviyo.
Klaviyo charges by "profile". When paired with Shopify, it automatically imports / pulls customer information 5o it's servers even when the customer specifically opted out of marketing.
First month, we were debited 3500EU for opted-out profiles that they had auto-pulled, against the consent of customers and us.
Even with the CEO looped in on emails, we had to threaten chargebacks before they refunded.
They also refused to remove data under our official GDPR request.
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