I got an email saying that we are using the Shopify API version 2019-04 but when I check through our private apps, it shows Webhook API version 2019-07.
The email mentions:
SOS Inventory (8cc07ff19560f6d9b5cca299643736ce)
I have no idea what is wrong?!
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You are using Shopify REST API endpoints either without specifying the version in URL (in which case Shopify defaults to the oldest stable version of API available which is 2019-04) or explicitly specifying 2019-04.
It is the version of the Webhook API, this is not the only version of the REST API the private app is using. Are there any other calls made by the app through the REST API?
Then the SOS app is using an older version of REST API :)
You might want to reach out directly to them, though they should have received a similar note. All in one, you should be safe using the app until Apr 2020 when the 2019-04 version would be gone forever, unless the team behind it upgrades the API version they are using to connect to Shopify.