Every email I get always has this written at the bottom FYI:
"Attention: Shopper Relations
Ipsos North America
Each pay cycle executes monthly on the 7th & 22nd, payments processed to shopper PayPal accounts on 15th & 31st each month.
Ipsos pay cycles may be adjusted to plus or minus 1 business day when a pay cycle period is impacted by a holiday.
Please ensure your active, registered, & verified PayPal email is updated in your ShopMetrics profile.
We appreciate your participation!"
Make sure they have your right Paypal address.