The API documentation states:
Whether deal probability is disabled or enabled for this pipeline
VALUES: 0 or 1
But I can’t find any documentation around what it means for deal_probability to be enabled or disabled for a pipeline. Is this implicit (e.g., if the pipeline has a >=1 deals with a set deal probability) or explicitly configured somehow?
GET/v1/pipelines/{id}
200
"data": {
"id": 1,
"name": "Pipeline",
"deal_probability": true, <===== THIS FIELD
Hello, @Duncan_Bryce and welcome to the community! 
The deal probability can be explicitly configured when adding and/or updating a pipeline.
When a pipeline has deal_probability
enabled, it’s allowed for deals in the pipeline to be assigned probabilities. Probability is the likelihood of winning a deal and adding its value to your company’s income (source).
Sincerely,
Helena
Thank you @Helena_Sul!
So, if deal_probability
is false, Pipedrive will not allow assignment of deal probabilities? Just stage probabilities?