If you are a Shopify plus customer, we would suggest connecting Toki with multipass so when your customers sign in to Shopify, they are also signing into Toki and vice versa.
First, you must find your multipass key:
From your Shopify admin, go to Settings > Customer accounts.
In the Multipass section, select Turn on to enable Multipass.
After you enable Multipass, a secret is shared with you. You need the secret to generate tokens to log your customers into your Shopify store.
Next, go back to your Toki portal. Go to Integrations and click on Shopify. There you will find the location to put your multipass key.