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The document is an assignment. That assignment obligates you to pay the factor for any and all invoices you receive from them. You should keep track of these, whether you decide to sign them or not, because you are legally bound to pay until you receive a release of the assignment. It can become complicated when a carrier jumps from one factor to another. Regardless of what the carrier may claim, or the new factoring company, you have to pay the original factor until you are released.