@Brendan After setting the subscription and testing it got me satisfying result. The next step would be to validate receipt by playfab (also done). Now binding it with playfab, it was not possible so I used another way around i.e. making the item consumable over time until and running a cloud script to grant the user the item after script validation, even then it was going great but I thought that my app will not only target ios and android but also platforms like tizen and amazon. Amazon is like play store and apple so I'll try it later as far as tizen goes I integrated Paypal as IAP but then the problem arised that playfab will not charge an automatic subscription and thet is not what I want.
I hope I made my question clear:
"SUBSCRIPTION IN PAYPAL"
Secondly after even setting the normal purchase up, nothing shows on the screen after clicking the button and the purchase is not even confirmed but the player is granted the object for paying for purchase ?