Restore Functionality: How can we check multiple restores on single restore button click

Restore Functionality: How can we check multiple restores on single restore button click .

M stuck in this situation, that my app need restore functionally on single click.
Explained:  I have 5 In-App products in my app, When i buy the products and delete my app and again installed in my device, Im not able to restore which i already purchased perviously. But the major challenge is that i need all the product restore automatically on Single Restore button.

Need Inputs

Thank you…