6 lines
338 B
Markdown
6 lines
338 B
Markdown
# D001 — Account-balance is the only prepaid writer
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**Status:** accepted
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**Step:** 1
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Prepaid cents, credits, usage, and payments persist in `zappier-account-balance` (`books.json`). zappier-edge `balanceCents` is a cache filled from the books reply. Tests without NATS/HTTP books still mutate the cache so unit tests stay hermetic.
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