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Dynamics 365 Community / Forums / Customer experience | Sales, Customer Insights,... / VAT validation Custome...
Customer experience | Sales, Customer Insights,...
Suggested Answer

VAT validation Customer Engagement

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Posted on by CU20021453-0 14
Does anyone know how to implement VAT validation in Customer Engagement?
Categories:
Dynamics 365 Sales
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  • Suggested answer
    11manish Profile Picture
    11manish 394 on at
    you can use below for VAT Validation 
     
    • Validate format (regex per country) by JavaScript
    • Call external API (e.g., VIES) by plugin 
  • Suggested answer
    ManoVerse Profile Picture
    ManoVerse 961 Super User 2026 Season 1 on at
    Just to elaborate Manish's answer here  and to cover your question:
     
    VAT validation in Dynamics 365 Customer Engagement (Dataverse) is commonly implemented in EU projects, most of the customers wants to 
    • Validate a VAT ID format
    • Verify the VAT ID exists and is active (for EU VAT -> VAT Information Exchange System[VIES] )
    • Store the validation result and status
    • Optionally block record save if invalid
    For most validation requirement are EU B2B and customer wants no cost and supported solutions where Powerautomate + VIES fits perfectly.
    and there are three ways you can implement this in customer Engagement:
    Option 1: Power Automate + VIES API call ( Recommened common approach) 
    1. User enters VAT number (e.g. on Account or Contact)
    2. A Power Automate cloud flow is triggered:
    3. On create/update of VAT field
    4. The flow Calls an external VAT service (most often EU VIES SOAP/REST) , parse the response and updates
    • VAT valid (Yes/No)
    • Company name
    • Validation date
    Pros
    • No code
    • Fully supported
    • Easy to maintain
    • Works with Dataverse security
    Cons : 
    • Not strictly synchronous (few seconds delay)
    Option 2:   Real‑time validation using a Plug‑in (C#)
    1. Register a synchronous plug‑in on Pre‑Create / Pre‑Update
    2. The plug‑in Calls a VAT validation API (VIES or 3rd‑party service) , Throws an exception if VAT is invalid
    Pros
    • Real‑time
    • Can hard‑block saving invalid VAT
    Cons
    • External calls inside plug‑ins can cause:
    • Performance issues
    • Timeouts
    • Dependency on service availability
    best practice is to avoid external HTTP calls in synchronous plug‑ins unless absolutely required.
     
    Option 3: Client‑side validation (format only)
    1. JavaScript on form Validates VAT structure/regex, Shows warning before save
    Pros
    • Fast & Simple
    Cons
    • Does not verify existence
    • Easy to bypass (API, imports)
    • Good for UX enhancement only

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11manish 138

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CU11031447-0 Profile Picture

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