I have gone through the all docs and have tried all possible options. It works fine when I pass notifyCustomer: true in both the payloads mentioned below in SS. But it also triggers an additional shipping confirmation email. https://prnt.sc/7qPDaNOQn...

Not sure if it works in REST but can't use it as a RATE limit issue.

No emails were triggered! I tried removing notifyCustomer in both payloads. It will trigger only in once case when notifyCustomer is true in both the payload.

Edit on above**And the tracking number update payload: https://prnt.sc/WS8IvRPwYr9k 

The snapshot of the payload for creating fulfillment in Shopify: https://prnt.sc/Gml0MZ-GZHz5 And the tracking number update payload: https://prnt.sc/Gml0MZ-GZHz5 No emails were triggered and if I pass true in both the payloads then it will work but ...

The tracking number email will trigger if I pass notifyCustomer: true when creating the fulfillment but it also will trigger the shipping confirmation email at the same time of fulfillment. So I just want to send an email when I update tracking detai...

I have been running through this problem since Shopify released the new Fulfillment API. And no acceptable solution is available on their API doc. I am using GraphQl which has type safety. It will throw an error for invalid data types. 

I am using fulfillmentCreateV2 mutation to fulfill the orders into Shopify, in the payload if I pass notifyCustomer: false so it won't trigger the Shipping confirmation email, but when I am writing tracking numbers back into Shopify using fulfillment...