Tags: bootpay/backend-python

test: load PG legacy API keys exclusively from .env

test/config.py: remove hardcoded PG application_id/private_key fallback,
read from BOOTPAY_PG_{APPLICATION_ID,PRIVATE_KEY}_{PROD,DEV} only.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>