API Calls: Fetch, Parse, and Compute

Question

## Problem

Given a paginated API, fetch all pages, parse the data, and compute an aggregate (e.g., total or average across records).

## Example
```
GET /data?page=N until empty -> compute average value
```

## Constraints
- Handle pagination and transient errors

## Approach
Loop pages until exhausted; retry on failure; aggregate. HubSpot's practical coding flavor.