The Order Fulfillment Process

Step	What happens	Who owns it
1. Receiving	Inbound stock is unloaded, counted and checked in against your ASN or PO	3PL, from your ASN
2. Storage	Units go into bin, shelf or pallet locations tracked by the WMS	3PL
3. Order processing	Orders sync from your store, get validated and released to the floor	Your store + 3PL integration
4. Picking	A picker follows a WMS route and scans each SKU	3PL
5. Packing	Contents are verified, boxed, dunnaged, and inserts added	3PL, to your packing rules
6. Shipping	The parcel is labeled, weighed, manifested and handed to the carrier	3PL + carrier
7. Returns	Items come back, are inspected, and restocked or disposed	3PL, to your returns rules

This sequence matches how 3PLs themselves describe the workflow; Simpl Fulfillment's walkthrough, for example, uses the same seven stages.

Receiving is where inventory accuracy is won or lost. What you should do:

• Send an ASN for every inbound, listing SKU, quantity, lot and expiry (if relevant) and carton count.
• Label cartons with SKU and quantity so the dock can count without opening every box.
• Agree a receiving SLA in writing (for example, received and available to sell within a set number of business days).
• Ask how discrepancies are reported. You want a receiving report that shows expected vs. counted per SKU.

Storage matters for speed and cost. Fast movers should sit in forward pick locations; slow movers in reserve. If you sell expiring goods, the WMS must record lot and expiration per location. See lot tracking and FEFO.

What goes wrong: stock arrives with no ASN and sits unreceived for days; units get received under the wrong SKU; mixed-SKU cartons get counted as one SKU. All three show up later as oversells or "missing" inventory (see 3PL inventory discrepancies).

When a customer checks out, the order syncs from your channel (Shopify, Amazon, TikTok Shop, a wholesale portal) into the 3PL's system. The 3PL validates the address, maps the SKUs, applies your rules (ship method, inserts, gift notes, holds) and releases the order to the floor.

The key number is the same-day cutoff: orders that arrive before it ship today. Published examples: Tondo Fulfillment lists 2:00 PM local time at its Delaware and Utah sites, Fulfillrite 2:00 PM local, Fulfyld 1:00 PM local and Simpl Fulfillment 12:00 PM CT.

What to check:

• How often orders sync (real-time webhook or a polling interval).
• What happens to orders with unmapped SKUs or bad addresses: are you alerted, or do they sit?
• Whether you can edit or cancel an order after it syncs, and until when.

Picking. The WMS generates a pick list or route. Common methods:

• Discrete: one picker, one order at a time. Simple, slower.
• Batch: one picker pulls several orders in one walk.
• Wave or zone: orders are released in timed waves or pickers stay in zones, used at higher volume.

Packing. The packer verifies contents, picks the box or mailer, adds dunnage and inserts, and seals. Your packing rules decide box selection, branded materials and which inserts go in which orders.

What goes wrong: look-alike SKUs (same product, different size or shade) get swapped; a kit component is missed; the wrong box size triggers dimensional-weight charges. The fix is scan verification at pick and at pack, plus distinct barcodes for every variant. Ask your 3PL: "Is every unit scanned at pick and again at pack, and what's your published accuracy claim?" Tondo, for example, claims 99.97% order accuracy and Fulfyld 99.9% pick accuracy (both provider claims, not audited).

The packed order is labeled, weighed and manifested with a carrier (USPS, UPS, FedEx, DHL or a regional). Tracking goes back to your store, which usually triggers the shipping-confirmation email.

Decisions you make here:

• Service levels: which carrier services map to your checkout options (standard, expedited, 2-day).
• Rate source: the 3PL's negotiated rates, your own carrier accounts, or an all-in price that includes postage.
• Channel rules: marketplaces set their own handling-time and tracking requirements. TikTok Shop and Amazon both do. See TikTok Shop fulfillment.

What goes wrong: labels get printed but parcels miss the carrier pickup, so tracking shows "label created" for a day. Ask for a daily shipped-vs-released report and a defined late-shipment credit in the SLA.

Customers request a label, ship the item back, and the 3PL receives, inspects and grades it. Your returns rules decide what happens next:

Grade	Typical action
New, sealed	Restock to sellable
Opened, resellable	Restock, or move to a B-stock SKU
Damaged or expired	Dispose, donate or return to you

The step isn't done until the inventory record is updated. Ask how many business days returns take to process and whether you get a per-return report with photos. For hygiene products (supplements, cosmetics, food), decide up front whether opened returns are ever restocked. Most brands say no.

Model	How it works	Fits when
In-house	You run your own space and staff	Low volume or highly custom orders
3PL	An outside provider does steps 1–7 for a fee	You want to scale without a warehouse
Dropshipping	Your supplier ships directly; you never hold stock	Testing products, low control needs
Marketplace fulfillment	Amazon FBA, Fulfilled by TikTok, WFS	Most sales come from that marketplace
Hybrid	A mix, such as a 3PL for DTC plus FBA for Amazon	Multichannel brands

If you're weighing in-house against outsourcing, start with what a 3PL is and when to switch.