code: public void setProviderARNs(java.util.Collection<String> providerARNs) {
          if (providerARNs == null) {
              this.providerARNs = null;
              return;
          }
  
          this.providerARNs = new java.util.ArrayList<String>(providerARNs);
      }
docs: <p>
  A list of the Amazon Cognito user pool ARNs for the <code>COGNITO_USER_POOLS</code> authorizer. Each element is
  of this format: <code>arn:aws:cognito-idp:{region}:{account_id}:userpool/{user_pool_id}</code>. For a
  <code>TOKEN</code> or <code>REQUEST</code> authorizer, this is not defined.
  </p>
  
  @param providerARNs
  A list of the Amazon Cognito user pool ARNs for the <code>COGNITO_USER_POOLS</code> authorizer. Each
  element is of this format: <code>arn:aws:cognito-idp:{region}:{account_id}:userpool/{user_pool_id}</code>.
  For a <code>TOKEN</code> or <code>REQUEST</code> authorizer, this is not defined.