Value type error to update Metafield using PUT request

Dear Support,

While I am sending a PUT request to update metafield info for a specific SKU, I am getting the following error:

API version:

2022-04

Payload:

{
"metafield":{
"id":12062743625794
,"value":"50"
,"value_type":"string"
}
}

Server Error:

{"errors":{"value_type":["is not valid"]}}

is that I need to provide:

'valueType','STRING