set tx_code in request

Signed-off-by: Mirko Mollik <mirkomollik@gmail.com>

Author: cre8

packages/client/lib/AccessTokenClient.ts

@@ -104,7 +104,7 @@ export class AccessTokenClient {
 
     if (credentialOfferRequest?.supportedFlows.includes(AuthzFlowType.PRE_AUTHORIZED_CODE_FLOW)) {
       this.assertAlphanumericPin(opts.pinMetadata, pin);
-      request.user_pin = pin;
+      request.tx_code = pin;
 
       request.grant_type = GrantTypes.PRE_AUTHORIZED_CODE;
       // we actually know it is there because of the isPreAuthCode call

packages/common/lib/types/Authorization.types.ts

@@ -312,7 +312,7 @@ export interface AccessTokenRequest {
   'pre-authorized_code': string;
   redirect_uri?: string;
   scope?: string;
-  user_pin?: string; //pre draft 13
+  user_pin?: string; //this is for v11, not required in v13 anymore
   tx_code?: string; //draft 13
   [s: string]: unknown;
 }