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Add a new field in LaunchDarkly to store the discount value. The field will be named serviceFeeDiscount with a value of N cents that will discount the calculated serviceFeeby that amount in cents.
A second new field will be added in LaunchDarkly named serviceFee that if populated will override the calculation previously used the calculate the serviceFee. After reviewing the code this feature already exists. As long as serviceFeePercent is null or 0 the value used will be the value stored in serviceFee.
Technical Solution
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Sequence diagram of solution flow
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Note that the proposed changes have synergy with the refinement to show the service fees in DMP: Feature - Show delivery fees in DMP
Detailed flow
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Simplified flow
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