From the MSA statement:

"We expect our suppliers, vendors and contractors (“suppliers”) to respect human rights and promote similar principles in their own supply chains. In FY16 Visa began developing a new supplier code of conduct that will outline these human rights expectations, including those related to the prevention of modern forms of slavery, as well as other dimensions of ethical conduct.

Today Visa’s Master Services Agreements with its suppliers require compliance with all applicable law in the performance of the agreement. In addition, each Visa supplier is subject to a thorough due diligence process. Our review is tailored to the type of supplier and the activities the supplier will be performing for Visa, and may include background screening, sanctions screening, or review of anti-bribery controls, for example.

The statement clarifies that suppliers are in agreements required to comply with laws, but the prohibition of modern slavery is not yet explicit in policies. Rather it is "expected" of suppliers that they do not engage in forms of modern slavery and it will be in the new policy that is under development.

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"Visa is committed to ensuring modern forms of slavery andhuman trafficking are not present in our supply chains and in our business. We expect our suppliers, vendors and contractors (“suppliers”) to respect human rights and promote similar principles in their own supply chains. In FY16 Visa began developing a new supplier code of conduct that will outline these human rights expectations, including those related to the prevention of modern forms of slavery, as well as other dimensions of ethical conduct.

Today Visa’s Master Services Agreements with its suppliers require compliance with all applicable law in the performance of the agreement."

Visa places the responsibility with their direct suppliers to have anti-slavery policies cascade down the supply chain.

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"We expect our suppliers, vendors and contractors (“suppliers”) to respect human rights and promote similar principles in their own supply chains."