The following are the steps for migration:
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1 - Connect PayPal to your Shopify.

2 - After that, we need the following data in the attached format:
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The sample files are attached for you to look over (at the bottom).

You will need to export the customer data file from PayPal, and you should be able to get the subscription data file from your existing app.
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To export data from PayPal, you can follow the article below.

https://intercom.help/appstle/en/articles/8550733-how-to-export-customer-data-from-paypal
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3 - After you provide us with the data, we will run the validations on our end and let you know if something is missing.
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4 - Once we get the final updated data, we will run the migration and keep subscriptions in a Paused state so that they do not get double charged from Appstle and your previous subscription platform.
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5 - You can see the migrated subscribers in Appstle after the final import,
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You can also watch this loom video to understand the values in each header for the subscription-data sample file below.
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​https://www.loom.com/share/93f5bdfb53044fbfa579ec24b26c073c?sid=39420f8e-22e3-4e27-9d1a-39010228b7dd
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​Subscription Data Sample
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