You dont need PAN for joining any affiliate programme but you do require it to pay your Income tax or any other tax.
No one can pay income tax without PAN. But why not take PAN it doesnt costs you much only around 100 INR and you will get it in 2 weeks or less.
You dont need PAN Card for Affliates You need to fill the W8BEN form as you are an Indian If the affiliates asks for W8BEN then scan and email or fax them Otherwise it ok
PAN CARD is a Card which is used for opening an account in Indian Banks and its for Income Tax purpose
It is not needed to open an bank account. Its just for anyone who has to pay tax he needs PAN card. Also PAN is required if you deposit an amount of 50,000 INR or more in cash in any bank in your account.
AFAIK, you need a PAN card just to file IT reurn, if your income comes in slab of paying taxes. In all other cases, you don't need a PAN card. And no affiliate program should ever ask for your PAN card
It depends on different affiliate programs. However it for sure you dont need PAN so dont worry about it.