Worked case · Failure and stress · 12 figures

Separate protection mechanisms

Separate reserves capital and liquidity

Figure 01 / 12

One purchase, several independent states

One purchase, several independent states — Separate protection mechanisms. Fictional batch; times illustrate order, not a rail guarantee. Exact values are in the figure data below.
Fictional batch; times illustrate order, not a rail guarantee

This case concerns separate reserves capital and liquidity. A success response, a completed capture, and settlement evidence are different observations. The sequence gives each event its own record instead of forcing all of them into one status field.

Figure data and text version
EventTimeRecorded fact
Order accepted09:00Commercial promise exists
Payment instruction09:01A stable payment identifier is assigned
Capture record09:02USD 809,600.00 captured across this batch
Settlement evidenceLaterUSD 607,200.00 observed as settled
Availability decisionAfter reconciliationUSD 397,513.60 available under the stated policy

A reserve restricts availability, capital absorbs losses, and liquidity meets payments when due. Counting the same money as independent protection in all three views overstates resilience.

The team treats restricted merchant funds as freely available operating liquidity.

All amounts, rates, capacity limits, and outcomes in this case are synthetic. The three conditions are separate assumptions for comparison. A better result in the response condition is not measured proof that the proposed control causes that improvement. The figures expose the calculation and its limits; a real deployment needs its own evidence.

Read the result

The batch begins with $920,000 of instructions and $809,600.00 of captured value. At the observation cutoff, $202,400.00 remains pending. After the stated refunds, fees, and restrictions, $397,513.60 is available for payout. The unresolved instruction count is 45; an unknown external result is handled separately from a known decline.

Model inputs and calculated values

Inputs below are the case-specific values. Each figure states the condition-specific assumptions and units used in its calculation. Calculated values are rounded for display.

InputValue
gross920,000
population7,600
feeRate0.019
Calculated valueResult
gross920,000
capture809,600
pending202,400
refund113,344
fee15,382.4
reserve80,960
available397,513.6
cash478,473.6
Figure 02 / 12

From captured value to available payout

From captured value to available payout — Separate protection mechanisms. USD; bridge components. Exact values are in the figure data below.
USD; bridge components

Captured value of $809,600.00 becomes $397,513.60 available after pending settlement, refunds, fees, and eligible restrictions. This is a financial bridge: the bars display each component’s amount, not a cumulative balance. Reserves are restrictions on availability, not an additional fee.

Figure data and text version
ComponentUSD
Captured value809,600
Still pending-202,400
Refunds-113,344
Fees-15,382.4
Restricted cover-80,960
Available payout397,513.6
Figure 03 / 12

Balanced postings are necessary but not sufficient

Balanced postings are necessary but not sufficient — Separate protection mechanisms. Simplified ledger; fees paid from merchant proceeds; one currency. Exact values are in the figure data below.
Simplified ledger; fees paid from merchant proceeds; one currency

The first entry records a settlement receivable and a merchant obligation for $809,600.00. Later entries move the observed settled amount to cash and record fees and refunds. Debits equal credits within each posting; external evidence is still required to establish that settlement occurred.

Figure data and text version
EntryDebit accountCredit accountUSD
CaptureSettlement receivableMerchant payable809,600
SettleBank cashSettlement receivable607,200
RefundMerchant payableBank cash113,344
Fee paidMerchant payableBank cash15,382.4
Figure 04 / 12

Recorded value and usable value differ

Recorded value and usable value differ — Separate protection mechanisms. USD; overlapping measures, not additive categories. Exact values are in the figure data below.
USD; overlapping measures, not additive categories

Gross instructions total $920,000, but only $809,600.00 has been captured. Pending value cannot be counted as settled cash in this illustration. The final availability decision also includes the stated restriction. These amounts are different views of one batch, so do not add the bars together.

Figure data and text version
ViewUSD
Instructed920,000
Captured809,600
Settled607,200
Cash after refunds and fees478,473.6
Available for payout397,513.6
Figure 05 / 12

Timing of receipts and uses

Timing of receipts and uses — Separate protection mechanisms. Cumulative USD. Exact values are in the figure data below.
Cumulative USD

The synthetic ladder stages both receipts and uses over five days. Its purpose is to make timing explicit. The fractions are illustrative scheduling assumptions, not observed payment-rail behavior. A positive total over the full period does not prove that funds are available at every earlier cutoff. Horizontal positions are the labeled observations or scenarios; equal spacing does not imply equal numerical increments.

Figure data and text version
PeriodCumulative receiptsCumulative uses
Day 060,72052,624
Day 1242,880210,496
Day 2425,040368,368
Day 3546,480473,616
Day 4607,200526,240
Figure 06 / 12

A reconciliation identity with explicit components

A reconciliation identity with explicit components — Separate protection mechanisms. USD; all values use the same batch cutoff. Exact values are in the figure data below.
USD; all values use the same batch cutoff

The identity is capture = pending + refunds + fees + restricted cover + available payout, provided cash after fees and refunds is nonnegative. Here both sides equal $809,600.00. The identity locates differences; it cannot validate an incorrect input source.

Figure data and text version
ComponentUSDEvidence
Captured809,600Batch records
Pending settlement202,400Batch records
Settled607,200Batch records
Refunds113,344Journal and availability policy
Fees15,382.4Journal and availability policy
Restricted cover80,960Journal and availability policy
Available payout397,513.6Journal and availability policy
Figure 07 / 12

One business action can produce several messages

One business action can produce several messages — Separate protection mechanisms. Message delivery versus business effect. Exact values are in the figure data below.
Message delivery versus business effect

The batch contains 7,600 intended actions and 12 duplicate attempts in this teaching trace. A stable action key identifies the business instruction. A transport identifier identifies one delivery attempt. Treating both identifiers as interchangeable is the route to duplicate financial effects.

Figure data and text version
StepContract
Receive7600 intended actions; 12 repeated deliveries
MatchLook up the business action key and request fingerprint
CommitCreate one journal effect within the approved transaction boundary
ReplyReturn the stored result or a controlled conflict
Figure 08 / 12

Unknown outcomes need their own queue

Unknown outcomes need their own queue — Separate protection mechanisms. Count; exclusive instruction states. Exact values are in the figure data below.
Count; exclusive instruction states

45 of the 7600 instructions have an unknown external outcome at the cutoff. They are not automatically failed. The remaining counts are constructed disjoint states for this example and sum to the total number of intended actions.

Figure data and text version
StateCount
Known complete6,947
Known declined608
Unknown external outcome45
Figure 09 / 12

A money record carries units and identity

A money record carries units and identity — Separate protection mechanisms. Illustrative machine record. Exact values are in the figure data below.
Illustrative machine record

An integer amount is meaningful only with its currency and exponent convention. A provider identifier is meaningful only with its namespace. The data contract keeps the action identity, financial amount, and external observation separate so they can be reconciled.

Figure data and text version
FieldExamplePurpose
batch_refSeparate protection mechanismsStable cohort identity
currencyUSDNo mixed-currency addition
gross_minor92,000,000Two decimal places in this USD example
availability_minor39,751,360Derived usable amount
settlement_statedelayedFinancial evidence state
Figure 10 / 12

Pending settlement changes available cash

Pending settlement changes available cash — Separate protection mechanisms. USD; all other inputs held fixed. Exact values are in the figure data below.
USD; all other inputs held fixed

This sensitivity calculation holds capture, refunds, fees, and reserve fixed, then varies the pending share. Available payout is floored at zero. The curve describes the stated formula, not a recommended payout hold or a forecast of return timing. Horizontal positions are the labeled observations or scenarios; equal spacing does not imply equal numerical increments.

Figure data and text version
Pending shareAvailable USD
0%599,913.6
5%559,433.6
10%518,953.6
20%437,993.6
30%357,033.6
40%276,073.6
Figure 11 / 12

Economic claims after the event

Economic claims after the event — Separate protection mechanisms. Illustrative responsibility map. Exact values are in the figure data below.
Illustrative responsibility map

The edges label obligations or evidence relationships. They do not assert that the named firm performs every legal role in every payment arrangement. The purpose is to keep the commercial promise, settlement evidence, and payout obligation visible at the same time.

Figure data and text version
FromToRelationship
Separate protection mechanismsMerchantFulfillment promise
ProcessorPlatform ledgerSettlement evidence
Platform ledgerMerchantPayout obligation
Platform ledgerReview queue45 unresolved
Figure 12 / 12

The close record preserves unresolved differences

The close record preserves unresolved differences — Separate protection mechanisms. Close-of-window record. Exact values are in the figure data below.
Close-of-window record

Available payout is $397,513.60; restricted cover is $80,960.00. The illustration also keeps 45 unresolved outcomes and $0.00 of any reserve shortfall visible. A close process should not hide unresolved items merely to force a report to balance.

Figure data and text version
MeasureValueOwner
Available payoutUSD 397,513.60Treasury
Restricted coverUSD 80,960.00Merchant risk
Unresolved instructions45Payment operations
Reserve shortfallUSD 0.00Exposure owner

Connect the result to the system

Map ownership, restrictions, timing, and permitted use before recognizing a balance as cover.

Check the population, evidence, permitted action, and actual effect together. A balanced calculation can still use the wrong population; a successful response can still leave an unknown financial outcome. The case’s numerical result applies only to its stated assumptions.

Sources and further reading

The chapter sources support the concepts and scope. They do not prescribe the synthetic model rates.

  1. Federal Reserve: payment systems
  2. Federal Reserve: Fedwire finality and settlement
  3. OCC Comptroller’s Handbook: merchant processing