Seen lots of people struggling with an API call to GPT-3. See here for reference:
The “prompt” parameter should be text formatted as JSON-safe. I normally add the API prompt text to a field in a data type using arbitrary text e.g ‘Generate 10 blog ideas using the prompt Multiline Input A’s text’:formatted as JSON-safe.
You can also make the other API call parameters dynamic. The temperature will need to be adjusted for your use case. Max tokens of 750 here is also just for my use case.