I’m sure you can imagine that you’ll lose a lot of customer accounts by doing this. That means as well you might lose newsletter, SMS and other GDPR approved contact details.
First migrate the passwords, then migrate the store
So to migrate the passwords, you need time and patience. Here is the order of execution:
Get a Shopify shop/BigCommerce
Implement an app/plugin/module for your old store
Each and every time a customer logs in, check wether the account already exists and either update the password or create the account with the password
Check on a regular basis how much accounts are already created.
Depending on how often your regulars visit you store, you can migrate the passwords in weeks, maybe it takes months. But sooner or later you reach the moment, were it doesn’t make sense to wait any longer and you migrate to the new system. Now you can migrate all other accounts and send out the activation/invite link – but you already reduced the amount of lost customers.
And this works for every Software as a Service, like Shopify, BigCommerce, etc.
If you need help with your migration, drop us an email, we are happy to help!