How can the body-transformer plugin access query parameters?

[andersonbui]

How can the body-transformer plugin access query parameters?

Using the body-transformer plugin, I need to access a piece of data (123456 and AppPrueba001) that comes in the URL of the original request, to send it in the body of the resulting request.

original request:

curl --location 'https://dominio_apisix.com/v1/123456/messages?appname=AppPrueba001' -H "Host: example.com" \
--data '{
    "to": "6543221",
    "type": "text",
    "text":  "text-message-content"
}'

Transformed request:

curl --location 'https://destinationdomain.com/v1/send_messages?' -H "Host: example.com" \ 
--data '{
    "to": "6543221",
    "type": "text",
    "text":  "text-message-content",
    "from": "123456",
    "appname": "AppPrueba001"
}'

How would this be done? Can you help me please?