From what I saw using Parse, storing many PFObjects accounts as 1 API call.
However, what I do not know about is that if there are any restrictions on the number of objects that will be saved immediately and will still be considered as 1 API call.
I also recommend that you test it yourself. Try to save several objects at once and see how your API causes a change in the number in the control panel.
Please note that batch operations will not be performed in general if one object does not work (for example, the object does not exist).
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