I am trying to build a checkout extension using javascript, which checks the provincecode entered in the checkout form and query my external api for if the entered pin code is in servicable or not. I am very new to checkout extension, please help me ...

Hi Liam,I have made my checkout extension app using javascript, how can I use this hook useEmail as it is a react hook only ?

you need to update your block schema as below, do change the id and label as you want.And then you will see something like the screenshot in your theme editor.Click on the hovered icon and you can select the metafield.Now metafields you can edit from...