I am building a public app I have plans to use metafields for collection third party information about a customer.
After my application installed on the Shopify marketplace, all new customers will be fille required metafields.
But. I have a question, what about existing customers(who created accounts before a public app with metafields was installed)? How can I ask them to add the required information to existing accounts for new purchases?
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It depends which information you will ask them to give you and how many customers you have... It could be an email, it could be a pop up, a call, etc. One thing for sure though, you will have to get them to send you the information if it is not already saved on your system.