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Captcha (from CAPTCHA - eng. C ompletely A utomated P ublic T uring test to tell C omputers and H umans A part - a fully automated public Turing test for distinguishing between computers and people) - a computer test used to determine who a user of a system is: a person or a computer.
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Some types of captcha

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title	Examples of parameters from different services

Note
Additional parameters and the value that these parameters can take are individual for each service.

Let's consider a few examples based on two popular services for recognition captcha.

2Captcha - when you go to the page with the API description https://2captcha.com/2captcha-api#solving_normal_captcha , scrolling through the table below you can find a table where the parameters that can be specified

here is only a part of the possible parameters

Anti-Captcha - there is also a table with valid parameters on the documentation page for solving simple text captchas

Even based on only these two services and only a small part of their parameters, you can see that

some parameters that are responsible for the same are named differently (case sensitivity - case and regesense )
others have the same name, answer for the same thing, but accept different types of values ( phrase)
there are parameters that coincide in name, purpose, accepted values, but in one service slightly more values can be passed than in another ( numeric )

Note
Be extremely careful when writing a project for several captcha services using additional parameters.

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