Hi @Manoj Singh ,
Welcome to Microsoft Q&A Platform. Thank you for the question.
First you have to create the functions which can contain the business validation and then you can call the function inside your logic app with desire input parameters.
From the function apps list, select your function app.
Please follow the below MS doc to understand the flow step by step,
Create and run code from workflows in Azure Logic Apps using Azure Functions
Regards,
Kamlesh Kumar
BizTalk Techie
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