Payments go out on a weekly net 7 schedule.  This means that once an invoice is generated, you will be paid that invoice 7 days later.  

Invoices are generated weekly, on Monday, for your earnings from Monday to Sunday.
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For example, on Monday May 14th you will receive an invoice from the previous week of earnings (Monday May 7th - Sunday May 13th).  This invoice will be paid 7 days later on the following Monday May 21st.

There is a $50 threshold to have an invoice created.  Invoices will only be generated on Monday if you have earned over $50 in the previous pay period.