Enter the NTN/GST number correctly.

Select the right province and Address.

Always choose the correct Sale Type to avoid issues in tax returns

Start with send box Testing Token then move to Live Token and URL

Testing Mode  :

Use the Testing Token during setup to check invoices and sales data.     

This helps identify and fix errors before going live.

Live Mode   : 

Once everything works correctly, apply the Live Token.     

From this point, all sales tax invoices are officially reported to FBR.

https://www.youtube.com/watch?v=pU1lsyeropQ