Changes to Get all payers

the response's body type changed from no type to object for status 200

deleted the header request parameter Authorization

the endpoint scheme security OAuthScheme was added to the API

added the optional property next_page_token to the response with the 200 status

added the optional property prev_page_token to the response with the 200 status

added the required property items to the response with the 200 status

api operation id getAll removed and replaced with v3_getAll