Shopforce B.V. The API endpoint to simply accomplish this is not publicly available, unfortunately.
You can only use the endpoint /v1/user/{user_id}/insights-search
to search for a specific date, but a category is required.
Example: /v1/user/{user_id}/insights-search?time_start=2021-01-01&time_end=2021-01-31&category=GENERAL
Supported categories:
"GENERAL", "SUBSCRIPTIONS", "CASH", "SAVINGS", "FINANCE", "TRANSPORT", "FAMILY", "SHOPPING", "ENTERTAINMENT", "FOOD_AND_DRINK", "GROCERIES", "PERSONAL_CARE", "HOUSEHOLD_EXPENSES", "TRAVEL", "BUSINESS_EXPENSES", "CAR_EXPENSES", "UNCATEGORIZED"