tags used in aweber integration

[ashish moon]

Hello!

There's a whole list of tags when it comes to integration with aweber, segregated as :

1. Package tag group
2. Order tag group
3. Customer tag group
4. Affiliate tag group and
5. Sale tag group

I wish to convey the "affiliate ID" to each of my product purchasers. Which tag from which group should I use? I have a choice from the following:

From Order tag group
1. #{Order.aff_user_id}
2. #{Order.user_id}

From Customer tag group
1. #{Customer.id}

From Affiliate tag group
1. #{Affiliate.id}

From Affiliate tag group
1. #{Sale.user_id}
2. #{Sale.aff_user_id}

Which ONE of the above tags should I use and WHY - Somebody please clarify?
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With reference to above, why are multiple tags being provided apparently for the same 'variable'? Or they all different variables?
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Also, What is the difference between

#{Affiliate.referer_id} AND
#{Customer.referer_id} ?
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Your answers will be highly appreciated.

Sincerely,

-Ashish