Core issue: pinpointing when Shopify captures a customer’s email to trigger abandoned checkout emails in a one-page checkout with only a “Pay now” button.
Initial assumption: simply entering an email did not trigger any event, so no abandoned cart sequence would start; the email might only be stored in session if the user returns on the same device.
Updated finding (after testing): Shopify’s native abandoned checkout email sequence is triggered once the shopper enters their email and then defocuses the email field (e.g., clicks/taps anywhere outside it). It does not require proceeding to shipping or clicking “Pay now,” and using billing as shipping does not change this.
Implications: This behavior applies to one-page checkout. Klaviyo should behave similarly since it relies on the same Shopify events.
Resolution: Confirmed trigger on email field blur; no special workaround needed beyond ensuring the email is captured when the field loses focus. Discussion concluded positively with thanks.
Does anyone know when does Shopify exactly capture the customer’s email to trigger abandon emails notifications?
Is it on the first checkout page? Or does he need to click on proceed to shipping? Because i chose use billing address for shipping address.
The whole checkout is on 1 page only and there is only the pay now button.
Does shopify still capture the email for abandoned checkout recovery?
Thank you in advance
Klaviyo will use the same principles as they use the same events. But what we need to know is at what exact moment fo they capture the email address. Is it on clicking on pay now? Or is the email captured as soon as the customer fill the email field.
Thank you again
Unfortunately, when an email is entered, no events trigger so the email is NOT added to an abandoned cart sequence. It’s the greatest downfall of the one-page checkout. Why Shopify?
It’s a bit frustrating since the email is still stored in the session if a person were to leave the page then return to the checkout on the same device.
Exactly, in fact, this is when it should capture the email for abamdoned checkout. Do you happen to have a solution for it? i will keep you posted if i find something 
I stand corrected. I’ve done additional testing. When the email is entered, Shopify’s native cart abandonment email sequence triggers. I think the trigger has to have a click or tap anywhere else outside the input box of the email address. This is great news.
Thank you for this amazing news Josh. I got your point. Thank you for this clear explanation. Best of regards and prosperity to your business.