Migrate toJSON to instance method defs

index.bs

@@ -1407,6 +1407,7 @@ that are returned to the caller when a new credential is created, or a new asser
         [SameObject] readonly attribute AuthenticatorResponse    response;
         [SameObject] readonly attribute DOMString?               authenticatorAttachment;
         AuthenticationExtensionsClientOutputs getClientExtensionResults();
+        TBD toJSON();
     };
 </xmp>
 <dl dfn-type="attribute" dfn-for="PublicKeyCredential">
@@ -1450,6 +1451,13 @@ that are returned to the caller when a new credential is created, or a new asser
         [=extension identifier=] → [=client extension output=] entries produced by the extension's
         [=client extension processing=].
 
+    :   {{PublicKeyCredential/toJSON()}}
+    ::  This operation returns a JSON-serialized representation of the instance of {{PublicKeyCredential}} suitable for submission
+        to a [=[RP]=] server as a payload with `application/json` mimetype. The [=client=] returns an object with the same structure
+        as the instance of the {{PublicKeyCredential}} with {{ArrayBuffer}} values encoded with [=base64url encoding=]. {{ArrayBuffer}}
+        values to be encoded are identified according to the detected type of the instance's `response` property, which will either be
+        {{AuthenticatorAttestationResponse}} or {{AuthenticatorAssertionResponse}}.
+
     :   <dfn>\[[type]]</dfn>
     ::  The {{PublicKeyCredential}} [=interface object=]'s {{Credential/[[type]]}} [=internal slot=]'s value is the string
         "`public-key`".
@@ -2399,18 +2407,6 @@ Upon invocation, the [=client=] takes the provided options and returns an identi
 
 </div>
 
-### Serialize Registration and Authentication ceremony responses - PublicKeyCredential's `toJSON()` Method ### {#sctn-toJSON}
-
-<div link-for-hint="WebAuthentication/toJSON">
-
-[=[WRPS]=] use this method to convert the instance of {{PublicKeyCredential}} returned from {{CredentialsContainer/create()|navigator.credentials.create()}} or {{CredentialsContainer/get()|navigator.credentials.get()}} to a JSON-serialized representations suitable for submission to a [=[RP]=] server as a payload with `application/json` mimetype.
-
-This method is intended to make WebAuthn API consumption tenable without requiring the use of third-party libraries.
-
-Upon invocation, the [=client=] returns an object with the same structure as the instance of the {{PublicKeyCredential}} with {{ArrayBuffer}} values encoded with [=base64url encoding=]. {{ArrayBuffer}} values to be encoded are identified according to the detected type of the instance's `response` property, which will either be {{AuthenticatorAttestationResponse}} or {{AuthenticatorAssertionResponse}}.
-
-</div>
-
 ## Authenticator Responses (interface <dfn interface>AuthenticatorResponse</dfn>) ## {#iface-authenticatorresponse}
 
 [=Authenticators=] respond to [=[RP]=] requests by returning an object derived from the