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Create custom fields for leads through the API

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Posted on by driftrock

Hi all,

I'm working on an integration for Dynamics 365 for Sales with our system, and I'm trying to figure out a couple of things.

One thing that I would like to be able to do is to add a custom field to a lead where I could save our systems' ID so that we can cross match it later as that lead is processed. I've found a lot of documentation about custom leads, but all of them are how to create them through the UI, I wasn't able to find any information about how to do it through the Web API.

What would be the correct way to create a custom field on an entity (Lead) through the API? Can I use the access token that I have with CRM scope, or do I need to use some other Apps?

Thanks!

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Wahaj Rashid 11,321 on at

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RE: Create custom fields for leads through the API

Hi,

Thank you for your query.

As far as I understood, you need to add a custom field to store the ID of an external system.

You do not need to create the field via API, you need to update this field using API.

Here is the high-level solution:

Create a field in the Lead Tabel (entity):

Go to Advanced Settings -> Customizations -> Customize this System (Or create a new solution).

Expand Entities -> Lead -> Fields.

Create a new field of type Text (string), for example, new_externalid.

Save and Publish the entity.

You can also add this field on the Lead form (optional).

Use Web API to update this field while creating or updating the record:

Create a table row using the Web API (Microsoft Dataverse) - Power Apps | Microsoft Docs

You can set the new field in the Payload:

POST [Organization URI]/api/data/v9.0/leads HTTP/1.1 Content-Type: application/json; charset=utf-8 OData-MaxVersion: 4.0 OData-Version: 4.0 Accept: application/json { "subject": "New Lead", "fullname": John Doe, "new_externalid":"LEAD-XYZ-00910" }

You can also update using web-api:

Update and delete table rows using the Web API (Microsoft Dataverse) - Power Apps | Microsoft Docs

Create a custom field:

Create and edit fields with Dynamics 365 Customer Engagement (on-premises) | Microsoft Docs

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driftrock 5 on at

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RE: Create custom fields for leads through the API

Is there a way to create the field in the Lead Table through the API instead of going through the interface as you describe? I'm working on a multitenant App, and I would like to be able to create a new "external_id" field for a lead without the interaction from the user (after they have done the login and I have a valid access token on their behalf)

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a33ik 84,331 Most Valuable Professional on at

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RE: Create custom fields for leads through the API

Hello,

It is possible to create custom columns using the API. Check this post - docs.microsoft.com/.../create-update-entity-definitions-using-web-api

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