Power Platform Community Forum Thread Details

Hello, community!

I hope everyone is doing well. I’m encountering an issue with a custom connector while trying to make a request to the WhatsApp Business API to send a text message. The workflow fails, and the error message I receive is:

The API operation 'SendTextMessage' requires the property 'body' to be of type 'Object' but is of type 'String'.

{
"messaging_product": "whatsapp",
"recipient_type": "individual",
"to": "+528134044875",
"type": "text",
"text": {
"preview_url": false,
"body": "text-message-content"
}
}

The Peak Code I’ve implemented looks like this:

{
"inputs": {
"host": {
"connectionName": "shared_whatsapp-5ffa150e7daae86389-5f7c8f2479de47eca0",
"operationId": "SendTextMessage",
"apiId": "/providers/Microsoft.PowerApps/apis/shared_whatsapp-5ffa150e7daae86389-5f7c8f2479de47eca0"
},
"parameters": {
"Content-Type": "application/json",
"body": {
"messaging_product": "whatsapp",
"recipient_type": "individual",
"to": "+528134044875",
"type": "text",
"text": {
"preview_url": false,
"body": "text-message-content"
}
}
},
"authentication": "@parameters('$authentication')"
},
"metadata": {
"operationMetadataId": "d7a777b3-6349-4835-b1ea-b760528a0baa"
}
}

I’ve tried manually typing the body in the Power Automate flow to ensure it’s passed as an object, but the error persists. I’ve also read that Power Automate custom connectors sometimes have compatibility issues and require workarounds. Can I try WhatsApp Plus APK as it have additional features.

As a beginner, I’d appreciate any guidance or suggestions to resolve this issue.

Thank you so much in advance for your help!

Categories:

Using connectors

To ensure your custom connector works properly, follow these steps:
1. Check the Action's Schema

Make sure the body parameter in your custom connector's definition is set as an Object. Here’s how to verify and update it:

In Power Automate's Custom Connector editor, open the SendTextMessage action.
Look for the body parameter and confirm its type is defined as Object.
If it’s mistakenly set as String, change it to Object.

2. Use an Expression in Power Automate

To ensure the body is treated as an object, use an expression in Power Automate's dynamic content box. For example:

json('{
"messaging_product": "whatsapp",
"recipient_type": "individual",
"to": "+528134044875",
"type": "text",
"text": {
"preview_url": false,
"body": "text-message-content"
}
}')

This explicitly instructs Power Automate to interpret the value as JSON.

3. Try re-adding the content type header in the custom connector definition the Content-Type header should be application/json