Data sent to google sheets is undefined


I try to send data from two input forms and a date select, to google sheets. In input form No. 1 is the number of items, no two is date and input form number three is the person’s name. When I press save, the data is suposed to be sent to google sheets.
I have created an api link with google disk and tested it in the browser and postman. It works fine and sends data to google sheets.
When I put the link in the api connector, I choose POST, action and text.
In the save buttons workflow, I choose api call from plugins.
But when I test the app, the data appears as undefined in google sheets.

How to fix it?

updatet with screenpics