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How to call a custom Business Central web service (unbound action) from Power Automate?

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Posted on by RK-29050523-0

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Hi,
Is there a way to call a web service through Power Automate?
Here’s the problem:
In Business Central, the bound action doesn’t support typical parameters. So, I created an unbound action, published it as a web service, and it works fine when tested directly.The issue is: how can I call this in Power Automate?
For example, I need to call a service like this:

With a body like this:

Any guidance would be appreciated.

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Dynamics 365 Business Central

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Sohail Ahmed 11,136 Super User 2025 Season 2 on at

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This might help you

https://community.dynamics.com/forums/thread/details/?threadid=4018b5fd-c546-f011-877a-7c1e521ba49a

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Sumit Singh 10,079 on at

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Yes. Use Power Automate’s HTTP with Microsoft Entra ID (Azure AD) action, or build a Custom Connector. The built‑in BC connector doesn’t invoke custom unbound actions directly.

Below are few suggestions and you can check over Sandbox environment first.

Option A – HTTP with Microsoft Entra ID (service principal)
1) App registration
- Register an app in Entra ID.
- API permissions: Dynamics 365 Business Central (Application) → API.ReadWrite.All (and/or Automation.ReadWrite.All). Grant admin consent.
- In Business Central (Entra ID Applications page), grant the app permission sets it needs.

2) In your flow
- Add “HTTP with Microsoft Entra ID”.
- Connection:
- Azure AD resource URI (audience): https://api.businesscentral.dynamics.com
- Tenant ID, Client ID, Client secret: from your app.

- Action setup:
- Method: POST
- URI:
    https://api.businesscentral.dynamics.com/v2.0/<tenant-id>/<environment>/ODataV4/ADVSearchAPI_SearchVendors?company='SampleCompany'
    (Alternatively, drop the query and add header X-Company: SampleCompany to avoid quote issues.)
- Headers:
    - Content-Type: application/json
    - Accept: application/json
    - X-Company: SampleCompany (preferred)
- Body:
    {
      "searchText": "World Traders"
    }

- Use body('HTTP')?['value'] to read the return (it’s Edm.String in your screenshot). If you want it typed, add a Parse JSON step with:
{ "type":"object", "properties": { "@odata.context":{"type":"string"}, "value":{"type":"string"} } }

Option B – Custom Connector (delegated sign‑in)
- Security: OAuth 2.0
- Auth URL: https://login.microsoftonline.com/{tenant}/oauth2/v2.0/authorize
- Token URL: https://login.microsoftonline.com/{tenant}/oauth2/v2.0/token
- Scope: https://api.businesscentral.dynamics.com/.default
- Host: api.businesscentral.dynamics.com, Base URL: /v2.0/{tenant}/{environment}/ODataV4
- Define an operation:
- POST /ADVSearchAPI_SearchVendors
- Query: company (string)
- Body: searchText (string)

Tips
- If company has spaces, prefer the X-Company header instead of ?company='…'.
- Parameter names in the JSON body must match your AL action parameter names (case sensitive).
- Handle 429/503 by enabling retry policy on the HTTP action.
Note: This answer is based on my understanding, with Microsoft Copilot helping me organize and polish the wording.
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YUN ZHU 95,331 Super User 2025 Season 2 on at

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You can use a more primitive method, which is more complicated but effective.

More details:

Using OAuth 2.0 to connect Business Central APIs and Web Services in Power Automate – OAuth in HTTP action

https://yzhums.com/33195/

Thanks.

ZHU

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Khushbu Rajvi. 20,275 Super User 2025 Season 2 on at

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Hope this helps: https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/webservices/odata-web-services

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Ramesh Kumar 7,527 Super User 2025 Season 2 on at

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I hope below can help you

https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/devenv-creating-and-interacting-with-odatav4-unbound-action?utm

Thanks

Ramesh

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