Transactional Mail for pending payments possible?

Hi @Spryke, welcome to the community.

I’m not as familiar with WooCommerce as I am with Shopify’s platform, but looking at Klaviyo’s WooCommerce Data article, I see that you’re right that there isn’t really a built-in “Event” for what you’re describing as an order that you mark as “On Hold.”

In other words, the native Klaviyo to WooCommerce integration only has “Ordered Product” and then “Fulfilled Order” and no events fire in between those two events (as far as I can tell).

You have a few options to go from here:

Create a Custom Event with Klaviyo’s API

If you are a developer or have access to one, you can create your own custom Metric (aka Event) that you can label as “Order On Hold” and pass the appropriate event properties (e.g. Email, Items, Order Amount, Payment Instructions, etc) to Klaviyo.

You can reference Klaviyo’s official PHP API on Github: klaviyo/php-klaviyo. A more generic introduction to Klaviyo’s API reference is also available here: API Reference.

Although more technical and perhaps more difficult to implement, you will be sending your Custom Events in the same way that Klaviyo’s Integration work.  

Create a Custom Event with a 3rd Party Middleware Tool like Zapier

If you’re comfortable with a third party tool, you can use a middleware tool like Zapier that can connect WooCommerce with Klaviyo.  Specifically for Zapier, I think you can use the Zapier → WooCommerce → Order Trigger → (Filtering for the Status for “On Hold”) and then pass it as a Custom Event you can label as “Order On Hold” using the Zapier → Klaviyo → Create Event Action. Of course there’s a lot of details and steps to step through but I think it can reasonably be done. 

Just note that Zapier would be an intermediary tool so it may need to be maintained and monitored and has its own pricing/fees - probably sufficient for a small or medium traffic site.  Unless you’re doing huge volumes of orders, you may want to go with the custom development method above which I find most WooCommerce folks prefer to do anyways.

Finally, once you have your Custom Metric “Order On Hold” in Klaviyo, you can then create a new Flow that triggers on it to send that automated message you mentioned to help customers fulfill their payment manually. 

Furthermore, you can use that same Custom Metric to be excluded as a Flow Filter in your Cart Abandonment Flow so that anyone who is in that scenario doesn’t get a Cart Abandonment email.

There might be other WooCommerce gurus here in the community that can give a better solution, but I hope this helps!