---
schema_version: "1"
id: e293de88104acb786397cc7fc763b6d973eb7a65e8ffb226f8ee40ded8ec7140
title: Design Considerations
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/xcloud/264-0-0/manage_vaccine_communications_design_considerations.md
canonical_url: https://help.salesforce.com/s/articleView?id=xcloud.manage_vaccine_communications_design_considerations.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: c310b7f305b9c773a045b6d80a9e8865692f88b57d88798a0a41230b318004a2
description: Keep these design considerations in mind when you manage vaccine communications with Marketing Cloud Engagement.
products:
  - Cross Cloud
release: "264"
---
# Design Considerations

Keep these design considerations in mind when you manage vaccine communications with Marketing Cloud Engagement.

## Account Configuration

- With SAP, the customer can save time by fully delegating their subdomain to the Engagement app. Hosting DNS takes longer.
- For SSL certificates, Engagement generates and controls both SSL certificates to prevent the lengthier forced redirection.

## Messaging Use Cases

Identify the trigger moment for each message type and where it’s initiated. Base this moment on a CRM object change such as appointment record creation or on CRM logic in a process builder or flow. Two examples are 2 hours before an appointment and message initiation.

## Core CRM Considerations

- The CRM object referenced in the Salesforce data Journey Builder entry source must relate back to ContactID, specifically Account.PersonContactID. Route people through journeys, not transactions.
- While most Marketing Cloud Connect traffic is excluded from CRM daily API limits, all current core APEX limits still apply.
- Watch for CPU CRM governor limits when using larger flows, more than 50 journeys, or setting up more than 50 journeys for the entry event referencing the same object.
- Together, Salesforce activities written back to CRM and Salesforce entry events injected into the journey contribute to governor limits.

## Related Content

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              <span style="vertical-align:text-bottom;display:inline-block;"><img style="width:40px;margin-bottom:0;" src="https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-xcloud-z_solutionkits-264-0-0-production-enus/1e49f40e-a11c-44f7-b439-8f20b6c66033/resources-global/_corporate/images/back_icon.png" alt="Icon of an arrow that points left."></span>
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              <p>Review earlier steps in this solution.</p>
              <ul>
                <li><a href="https://help.salesforce.com/s/articleView?id=xcloud.manage_vaccine_communications_workflow.htm&amp;release=264.0.0&amp;type=5" title="Learn how data flows through the configurations when you manage vaccine communications with Marketing Cloud Engagement.">Workflow</a></li>
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              <span style="vertical-align:text-bottom;display:inline-block;"><img style="width:40px;margin-bottom:0;" src="https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-xcloud-z_solutionkits-264-0-0-production-enus/1e49f40e-a11c-44f7-b439-8f20b6c66033/resources-global/_corporate/images/next_icon.png" alt="Icon of an arrow that points left."></span>
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            <td class="slds-cell-wrap" style="vertical-align:top;">
              <p>Take the next steps in this implementation.</p>
              <ul>
                <li>
                  <a href="https://help.salesforce.com/s/articleView?id=xcloud.manage_vaccine_communications_configurations.htm&amp;release=264.0.0&amp;type=5" title="Use these configurations to manage vaccine communications with Marketing Cloud Engagement.">Configurations</a>
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#### See Also

- [Marketing Cloud Connect](https://help.salesforce.com/s/articleView?id=mktg.mc_co_marketing_cloud_connect.htm&type=5&language=en_US)
- [Install the Marketing Cloud Connect Managed Package](https://help.salesforce.com/s/articleView?id=mktg.mc_co_install_marketing_cloud_connect.htm&type=5&language=en_US)
- [Marketing Cloud Connect Frequently Asked Questions](https://help.salesforce.com/s/articleView?id=mktg.mc_co_faq.htm&type=5&language=en_US)
- [Manage Customer Journeys](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_journey_types.htm&type=5&language=en_US)
- [Multi-Step Journeys](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_multistep_journeys.htm&type=5&language=en_US)
- [Transactional Send Journeys](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_transactional_send_journeys.htm&type=5&language=en_US)
- [Entry Sources](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_entry_sources.htm&type=5&language=en_US)
- [The Salesforce Data Event](https://help.salesforce.com/s/articleView?id=mktg.mc_jb_salesforce_data_event.htm&type=5&language=en_US)
- [Synchronized Data Sources in Contact Builder](https://help.salesforce.com/s/articleView?id=mktg.mc_cab_data_integration_for_your_account_with_synchronized_data_sources.htm&type=5&language=en_US)
- [Create Synchronized Data Sources in Contact Builder](https://help.salesforce.com/s/articleView?id=mktg.mc_cab_creating_and_interacting_with_synchronized_data_sources.htm&type=5&language=en_US)
- [Synchronized Object Relationship Priority](https://help.salesforce.com/s/articleView?id=mktg.mc_cab_synch_object_relationship_priority.htm&type=5&language=en_US)
- [Synchronized Data Extensions: Limit of 250 Fields](https://help.salesforce.com/s/articleView?id=release-notes.rn_marketing_engagement_archive.htm&type=5&language=en_US)