3PL software built for how you actually bill
Your WMS tracks inventory. It was never built to turn a receipt, a pick and eleven storage days into one invoice a client will not dispute.
What makes 3PL software different
5 things that decide this
- 01A 3PL does not sell space. It sells activity: a receipt, a pick, a pallet stored for a day. Off-the-shelf WMS tools track inventory well and bill it badly.
- 02Rating engines have to hold different contract terms per client, sometimes per SKU, and change without a code deploy when a client renegotiates.
- 03EDI 940 (warehouse shipping order) and 945 (shipping advice) are how a client's ERP talks to your warehouse. A malformed 945 is a shipment that looks unfulfilled to the client's system.
- 04NetSuite and SAP integration is where most 3PL projects actually stall, because the WMS and the ERP each believe a different number is correct.
- 05The invoice is the product review. A client disputes a line item, and the only fix is a record that shows exactly which activity generated that charge.
The warehouse and the invoice tell different stories
Most WMS platforms are built to answer one question well: where is the inventory right now. That is the wrong question for billing, which needs to answer a harder one: what activity happened, on what date, against which client's contract.
So teams bolt a spreadsheet onto the WMS. Someone pulls a report, applies the rate card by hand, and hopes the storage-day count matches what actually sat on the shelf. It rarely does, because storage billing depends on when a pallet moved, not when someone remembered to log it.
Build the rating engine as its own system instead. Every receipt, pick and storage day becomes a billable event the moment it happens, tagged to a contract. The invoice is then a query against events that already exist, not a reconstruction.
- 01A billable event is created at the point of work, not assembled later from a report.
- 02Storage-day counts run off a daily snapshot.
- 03Rate cards live in configuration. A client-success person can edit one without a deploy.
- Receipt940 in. A billable event, timestamped.
- StoreDaily snapshot, not a monthly guess.
- PickRated against the client's contract terms.
- Ship945 out. Must match what the WMS says moved.
- ReconcileInvoice line traced back to one event.
A sales demo covers receipt and ship. Disputes happen at reconcile, when a client asks why line fourteen costs what it does.
What we build for a 3PL
Activity-based rating engines
A rate card per client, sometimes per SKU or per zone, that produces one billable event per receipt, pick or storage day. Changing a rate is a configuration edit, not a deploy.
EDI 940/945 and ERP integration
Warehouse shipping orders in, shipping advice out, built so a malformed transaction gets caught and flagged rather than silently rejected on the client's side.
NetSuite and SAP 3PL modules
Two systems, one truth. We decide up front which system owns inventory count and which owns the financial record, then build the sync so neither one silently overwrites the other.
Eligibility-gated warehouse staffing
Shift Link validates a worker's documents and right-to-work status before a shift is offered, cutting manual compliance verification by 70%. The same pattern gates who can run equipment on your floor.
A storage-day count nobody can defend
A pallet arrives Tuesday and ships the following Wednesday. Your invoice says eight storage days. The client's own tracking, pulled from your portal, says seven. Nobody can say which count is right, because neither side stored the daily state, only the start and end.
That argument repeats across a hundred pallets a month, and every one costs someone an afternoon. The fix is a daily snapshot: a row per pallet per day. A storage charge is then a count of rows, not a subtraction between two dates that might be wrong.
The same discipline applies to a 945. If the shipping advice does not match what the WMS recorded as picked, the client's ERP shows a shipment that never happened on their end. Catch that mismatch before it reaches their system, not after their accounts team calls.
- Snapshot storage state daily. A date-range subtraction is a guess, not a record.
- Validate the outbound 945 before it transmits.
- Never overwrite a billed event. Post an adjustment instead, and keep both visible.
The reconciliation and eligibility engineering behind these builds
The spreadsheet approach against ours
| Criterion | The usual approach | How we build it |
|---|---|---|
| Billable events | Assembled from a WMS report at month end. | Created at the point of work: receipt, pick, storage day. |
| Storage-day counts | Subtracted from two dates in a report. | Counted from a daily snapshot per pallet. |
| Rate changes | A developer edits a formula or a spreadsheet. | A client-success person edits a configured rate card. |
| Outbound 945 | Sent, and any mismatch is the client's problem to find. | Validated against the WMS pick record before it transmits. |
| Your existing WMS or ERP | Replaced, at high risk, to fix a billing gap. | Left alone. It stays the system of record; we build the layer around it. |
The stack behind these builds
Built with
Billing and reconciliation
Integrations we have shipped
Questions 3PLs and warehouse operators ask first
01Can you build an activity-based rating engine?
Yes. Each receipt, pick or storage day becomes a billable event, tagged to a client's contract terms, the moment it happens. An invoice is then a query against real events, not a report assembled by hand at month end. Rate changes live in configuration, not code.
02Do you work with EDI 940 and 945 transactions?
Yes. A 940 brings in a warehouse shipping order and a 945 confirms what actually shipped. We validate an outbound 945 against the WMS pick record before it transmits. A mismatch is caught on your side, not left to surface as a phantom shipment on the client's ERP.
03Can you integrate our WMS with NetSuite or SAP?
Yes, and the first decision is which system owns each fact: inventory count, financial record, contract terms. Once that is written down, we build the sync so neither system silently overwrites the other. A daily reconciliation flags drift the same day.
04Will this replace our warehouse management system?
No, and be cautious of anyone who offers to replace it outright. Your WMS stays the system of record for inventory. We build the rating and reconciliation layer around it, which is usually the part it was never designed to do well.
05What experience do you bring to 3PL billing?
The engineering a 3PL rating engine runs on: activity-based billing events, daily reconciliation, and integration against a system of record that never gets contradicted. We have shipped that exact pattern in eligibility-gated staffing and multi-processor billing reconciliation, and it transfers directly to receipts, picks and storage days.
06How do you stop a storage-day dispute?
Snapshot storage state daily instead of subtracting two dates. A charge for eight storage days should be eight rows you can show the client. Each row carries a date and a pallet ID, so it is a record, not an arithmetic claim they have to trust.
07What does a first engagement with you look like?
Scoping calls cost nothing, so start there with your worst billing dispute from the last quarter. If answering it means reading your existing WMS or ERP integration first, we run a paid two-week diagnostic that ends in a fixed price.
Go deeper
- Logistics software development →The carrier and last-mile side of the same operating problem.
- Supply chain software →Warehouse and inventory exceptions, from the operator's side.
- Reconciliation →How two records of the same event are made to agree.
- API integration →The service behind EDI and ERP integration work.
