Added narrative to: Overview page to point to the new APIs in the Exchange Methods section of the page PDex Implementation, Actors, Interactions, Data Payloads and Methods page in the Interaction Methods section of the page   This version of the IG adds new APIs that support the requirements of the CMS Prior Authorization Rule (CMS-0057). These APIs are: [Provider Access API] (provider-access-api.html). [Payer-to-Payer Bulk API] (payertopayerbulkexchange.html) Earlier versions of the PDex IG recommended the use of CDS Hooks to enable Provider Access to ember data. That method has been superseded by the [Provider Access API] (provider-access-api.html) that meets the requirements of the CMS Prior Authorization Rule (CMS-0057).