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Shopify - customer/create KeyError?

Hi guys,
I’ve been trying to implement Shopify, but I’m running into an issue I don’t quite understand:
I added a webhook on shopify side on ‘Customer Creation’.
When I send a ‘test notification’, I receive an error in my logs saying
KeyError: 'customers/create'
When I look at the code in erpnext/erpnext_integrations/connectors/shopify_connection I found a method ‘validate_customer’. I thought that when a customer was created it would go through the validation, but it doesn’t.
How can I achieve this? Any Clues?

-----EDIT--------
Or rather I should ask: is it possible to create a customer or product on their own? Does ERP offer this option or do I need to do it myself?
From what I see they get created at the same time as the Sales Order, but I found it inconvenient! So I was looking for another way to do it.