We've finished a few more shops at work in recent months, including some Shopify ones. What we learned there was that Shopify is a very capable solution, provided you can adapt your requirements to the way Shopify works. We sadly have had a customer that insisted on using Shopify, but came with loads of requirements for which we needed to force shopify to work in ways it wasn't really designed for. In the end, we got it to work, but it would have cost that particular customer a lot less if he had gone for a Shopware (or magento2) solution because that kind of platforms give you more freedom if you need it.
There was a paypal integration with oledrion at the time, but I don't think it will still work without change.
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