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The Yuko REST API doesn’t have an endpoint to create or update customers. Yuko creates and updates customer records automatically from your Shopify store (through the store sync and Shopify customer webhooks), so store customers are available to the API without any extra step.
A customer Yuko hasn’t synced yet returns 404 with "Customer not found".

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Identifying a customer

To work with a customer through the API, pass their store customer ID (for example the Shopify customer ID) as customer_id, or as the {id} path parameter when retrieving one customer. Yuko’s internal customer UUID isn’t accepted here. See the Customer Object for the fields Yuko returns.