W-8BEN is a certificate mandated by the US government to collect Non-resident Tax information like their tax residency status. The purpose of the form is to do the correct withholding of tax.
Foreign Tax Identifier will be the Indian PAN
Since you will be residing in India and providing services through the WFH medium, you will remain an Indian resident for tax purposes.
Your recipient will pay you for your services after deducting the relevant taxes required as per the US laws.
The tax paid by the US government will be allowed as a tax benefit in India. While calculating the tax in India at the time of return filing, the tax already paid to your recipient's country will be allowed as a tax credit.
You can refer to this link for the Agreement for avoidance of double taxation of income with the USA
https://www.incometaxindia.gov.in/pages/international-taxation/dtaa.aspx
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