Hello @Honey_G,
Welcome to the Klaviyo Community!
It sounds like you’re trying to send both a post-purchase email and a welcome series flow email to users that have subscribed and placed an order. Both of which can be achieved without the need of using Zapier.
If you haven’t already, I would suggest enabling the Sync your Shopify email subscribers to Klaviyo setting under your Shopify integration. Doing so would allow users who go through the checkout process and subscribe to your newsletter to be added to a Klaviyo list. This way, you can automatically trigger a welcome series flow for users who complete their purchase.
Because these users completed their purchase, a Placed Order event should be recorded. This means you would also be able to create metric triggered flow based on this event to send a post-purchase email to these customers.
I would suggest taking a look through the resources we offer below. I’ve also included some Academy courses to help get you started with Klaviyo too:
I hope this helps!
David