Docs - Payment Detection in Request API

[MantisClone]

Problem

Growth team gets a lot of questions about "what is payment detection, why is it important?"

Proposed Solution

High level description of Payment Detection in Request API.

(Current payment detection docs are all SDK focused).

Context

Private Slack Thread

[MantisClone]

Key Point - Explain it from the "API" standpoint. Explain why our payment detection is great. Expain at high level