Can you figure out if bonus for purchases through skymiles shopping are per retailer, or one for the portal altogether?
from their t&c, so the answer is no.
Eligibility of Transactions: Only accrual partner transactions with an activity date between March 24, 2017 to June 30, 2017 will be considered for bonuses. Activity date is defined as the date of the transaction as reported by the partner regardless of the date the transaction is posted in the member’s account. Some partners offer multiple ways to earn miles under different products, brands, merchants, conversion of currency to miles, etc. These will still be considered as a single partner. Some examples of these cases are: Hotels booked via delta.com Hotels or Agoda.com, merchants under the SkyMiles Shopping program, restaurants under the SkyMiles Dining program, Cruises under the SkyMiles Cruises program, hotel brands under the same Hotel portfolio, partner activity and a points conversion to miles from the same partner and others.