Not Payer, it should be Provider

Existing Wording:

Ordering Provider systems Systems that manage data on behalf of a payer who is a source for data to be transferred
Performing Provider / Supplier systems Systems that manage data on behalf of a payer who is an intended recipient of transferred data.

Proposed Wording:

Ordering Provider Systems: Systems that manage data on behalf of a payer provider who is a source for data to be transferred\.
Performing Provider / Supplier Systems Systems that manage data on behalf of a payer provider who is an intended recipient of transferred data\.