Functional Stream Processing

SberPay receives a collection of payment operations. Build a functional processing pipeline that keeps only completed operations meeting an amount threshold and belonging to an allowed category, then transforms and ranks the results.

Implement process_operations(operations, min_amount, allowed_categories).

Formal Specification

• operations is a list of dictionaries. Each dictionary contains:
  • id: a unique string
  • amount: a non-negative number
  • status: a string such as "completed" or "declined"
  • category: a string
• min_amount is a non-negative number. The threshold is inclusive.
• allowed_categories is a list of strings.
• Return a new list of dictionaries containing only id, amount, and category.
• Include operations where status == "completed", amount >= min_amount, and category is allowed.
• Sort the result by decreasing amount. For equal amounts, sort by increasing id.
• Do not modify the input list or its dictionaries. Use functional stream operations such as filter, map, and sorted.