where to pay visa interview fee online?

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I am in USA and planning to go to canada for my 2nd h1-b stamping. I have completed Ds-160 form but couldn't find anyway to pay and book for visa appointment. Can anyone please share the link here will be of great help. Please note I am in USA. I have found a link to pay fee but it didn't had canada or Usa option.

Thanks

Rahul