Unfortunately seems not to exists this information at this time.
Quite embarassing thinking that we have only 5 months left to the switchoff of the checkout.liquid customization
Topic summary
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Issue: In a Checkout Extensions Web Pixel for Google Tag Manager, the standard event checkout_shipping_info_submitted exposes shippingLine, but it didn’t include the shipping rate title as expected (docs mention it transitions after selection). Only the price was visible in testing.
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Initial view: Another participant believed the title wasn’t available, noting concern given the upcoming checkout.liquid deprecation timeline (~5 months mentioned).
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Resolution: The shipping rate title can be obtained via event.data.checkout?.delivery?.selectedDeliveryOptions[0]?.title.
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Update/context: A Shopify changelog (“More data fields available in web pixels,” released early summer) likely introduced or documented these additional fields.
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Outcome: A working method to access the shipping rate title now exists through the delivery.selectedDeliveryOptions array. The thread is resolved; no outstanding questions.