I found the solution to its permission issue we can say. we have to make the "Access Products" checked it's not mentioned anywhere in docs but it's working Thank you @Visely-Team  @_JB 

@Visely-Team  Yes, the Product is also available. have inventory  and assigned to online channel

Hi @Visely-Team  "my-handle" Its just the example I have tested with the correct handle 

did anyone can help me here I am using storefront API Query looks like { productByHandle(handle:"my-handle") { variants(first:1) { edges { node { id } } } } }and the response is coming like { ...