On March 22, 2021  we will begin to sunset portfolio  (shared) Enhanced cost-per-click (ECPC) bid strategies. The following behaviors will be blocked in all versions of both the AdWords API and the Google Ads API:
  Creating new portfolio ECPC strategies. 
  Attaching portfolio ECPC strategies to campaigns. 
 
Note that standard (non-portfolio) ECPC strategies will not be affected. Change Description Migration Description Self-migration using Google Ads API CampaignService.MutateCampaigns()manual_cpc.enhanced_cpc_enabled
operations: [
  {
    update: {
      resource_mame: customers/CUSTOMER_ID/campaigns/CAMPAIGN_ID,
      manual_cpc: {
        enhanced_cpc_enabled: true
      }
    },
    update_mask: manual_cpc.enhanced_cpc_enabled
  }
] 
Self-migration using AdWords API CampaignService.mutate()biddingStrategyTypeMANUAL_CPC, and its biddingScheme.enhancedCpc
<operations>
  <operator>SET</operator>
  <operand>
    <id>CAMPAIGN_ID</id>
    <biddingStrategyConfiguration>
      <biddingStrategyType>MANUAL_CPC</biddingStrategyType>
      <biddingScheme>
        <enhancedCpcEnabled>true</enhancedCpcEnabled>
      </biddingScheme>
    </biddingStrategyConfiguration>
  </operand>
</operations> 
If you have any questions or need additional help, contact us via the forum  or at googleadsapi-support@google.com .