Once you have logged in to your account, access the Native integrations page and click on the Shopify integration.
You will be asked to write a store name. Choose the store you want to import customers from and include it as in the example: acme.myshopify.com and click Next.
You will be redirected to the Shopify log in page. Insert your credentials and hit the Log in button to authorize the Retently integration.
Next, you will be redirected back to the Shopify's settings page on Retently. You will see a list with a counter for the total number of customers. To import them, click on the Sync now button.
Once the syncing process has completed, you can enable the auto-sync option and have your new customers imported automatically to your Retently account.