Selling Partner API (SP-API)

Automate Seller Central with production-grade SP-API

Orders, inventory, catalog, pricing, reports, and notifications—connected securely to your ERP, WMS, data warehouse, or custom tools. Built for rate limits, uptime, and long-term ownership.

  • OAuth & token lifecycle
  • Rate-limit aware design
  • ERP / WMS connectors
  • Monitoring & runbooks

End-to-end

Auth through reporting

SLO-minded

Alerts & observability

24/7

Automation coverage

SP-API pipeline
Seller Central
SP-API
Your stack
The challenge

Manual Seller Central work doesn’t scale

Spreadsheet exports, click-ops in Seller Central, and brittle scripts break under peak volume. Teams lose hours reconciling inventory, chasing order status, and stitching reports for finance.

Selling Partner API (SP-API) is Amazon’s modern REST surface for orders, inventory, listings, pricing, reports, and operational events. Done right, it becomes the backbone of your marketplace operations—not a one-off integration.

Without SP-API

Manual updates, delayed inventory, fragile CSV workflows, and limited visibility when something fails.

With Coretech3

Idempotent jobs, OAuth lifecycle, rate-limit backoff, structured logging, and connectors your ops team can run.

Near real-time operational data
Automation across catalog & fulfillment
Architectures that scale with volume
Least-privilege OAuth access
Capabilities

SP-API domains we design & ship

Focused builds—from a single workflow to a full automation platform across marketplaces.

Order management

Order management

Ingest orders, track statuses, and coordinate fulfillment with dependable polling and notification handling.

  • Order ingestion & acknowledgements
  • Shipment confirmations
  • High-volume batch flows
  • Multi-channel handoffs
Inventory & inbound

Inventory & inbound

Keep stock positions truthful across channels with disciplined sync windows and exception handling.

  • FBA & MFN quantity sync
  • Inbound shipment visibility
  • Low-stock signals
  • Multi-warehouse logic
Pricing & competitiveness

Pricing & competitiveness

Implement repricing and guardrails that respect margin floors and marketplace policies.

  • Rule-based price updates
  • Competitive signals
  • Buy Box strategy support
  • Profit protection
Listings & catalog

Listings & catalog

Bulk listing workflows, content updates, and variation maintenance with validation upfront.

  • Feeds & listings APIs
  • Content QA checkpoints
  • Variation modeling
  • Issue remediation
Advertising workflows

Advertising workflows

Pair marketplace ops with advertising data where it matters—often alongside our Advertising API work.

  • Campaign ops automation
  • Structured exports
  • Performance rollups
  • Cross-team reporting
Advertising API
Reports & notifications

Reports & notifications

Automate report requests, parse outputs, and react to events before they become fire drills.

  • Scheduled reporting
  • P&L-ready datasets
  • Event-driven alerts
  • Custom dashboards
Coverage map

API surfaces we work across

Representative areas—your build may combine multiple APIs, queues, and data stores.

Orders & fulfillment

  • Orders API
  • Feeds & notifications
  • Fulfillment outbound
  • Merchant fulfillment
  • Vendor PO flows
  • Shipment tracking

Inventory & FBA

  • FBA inventory
  • Inbound plans
  • Replenishment signals
  • Multi-location stock
  • Fee & reimbursement exports
  • Removal workflows

Pricing & merchandising

  • Listings items
  • Catalog submissions
  • Pricing automation hooks
  • A+ where applicable
  • Buy Box analytics inputs
  • Feeds orchestration

Analytics & finance

  • Sales & traffic reports
  • Settlement views
  • Profit modeling inputs
  • Account health signals
  • Operational KPIs
  • Executive summaries
Delivery

How we run an SP-API program

Transparent phases—from discovery through hypercare—so stakeholders always know what ships next.

01

Discovery & scope

Map workflows, systems, data contracts, SLAs, and compliance constraints.

02

Auth & apps

Register developer assets, roles, redirect URIs, and token lifecycle handling.

03

Build & integrate

Implement APIs, queues, stores, and internal UX with code review and observability.

04

Sandbox validation

Exercise edge cases, backoff paths, and reconciliation checks before production traffic.

05

Launch

Progressive rollout, monitoring, and rollback plans aligned with your ops cadence.

06

Operate & improve

Maintenance windows, dependency upgrades, and iterative enhancements.

Why Coretech3

Engineering partner—not a one-off script shop

We ship integrations that survive peak events: backoff strategies, structured logging, alerting, and documentation your team can operate. Engagements range from targeted APIs to multi-workstream automation programs.

Faster time-to-value

Reuse proven patterns for auth, token rotation, sandbox validation, and production cutover—without sacrificing your edge cases.

Security-minded delivery

Least-privilege roles, secret hygiene, and operational guardrails aligned with how Amazon expects SP-API clients to behave.

Amazon seller operations dashboard

What teams gain

Operational efficiency

Less manual reconciliation and fewer spreadsheet bridges.

Consistent data

One operational truth flowing to finance and ops.

Scalable throughput

Architectures that tolerate spikes and growing SKU counts.

Clear decisions

Timely metrics instead of stale exports.

Lower unit cost

Automation amortizes engineering across volume.

Competitive responsiveness

React faster on inventory, pricing, and fulfillment.

Modernization

Migrate from MWS to SP-API

Still on legacy MWS? We map functional parity, refactor authentication, and validate feeds and reports under SP-API—minimizing downtime and surprises during cutover.

Controlled transition

Dual-running where practical, with reconciliation checkpoints between systems.

Capability uplift

Adopt newer primitives where they simplify operations—without boiling the ocean.

Why migrate now

Modern REST contracts

Easier to integrate with contemporary services and observability stacks.

Stronger auth patterns

OAuth flows and constrained roles reduce accidental exposure.

Access to new APIs

Features and datasets not exposed via legacy surfaces.

Operational clarity

Better alignment with Amazon’s platform roadmap and notices.

Future compliance

Stay aligned as marketplace requirements evolve.

FAQ

Common questions about SP-API projects

A focused workflow (for example, order sync into an existing OMS) often lands in a few weeks. Broader programs—multi-marketplace inventory, reports, and ERP connectors—are scoped in phases so you ship value early.

Yes. We guide app registration, roles, redirect URIs, and production token lifecycle—including refresh, rotation, and secure storage patterns that fit your infrastructure.

That is a core part of our work. We design stable contracts between Amazon data and your internal systems, with retries, idempotency, and clear ownership for exceptions.

We design for Amazon quotas from day one: backoff, queueing, prioritization of critical paths, and monitoring so spikes do not silently drop work.

Yes. We offer hypercare after cutover and longer-term retainers for API changes, dependency upgrades, and new automation workstreams.
Engagement & investment

Clear bands before a formal quote

Final quote after scope. Prices in USD; UK clients billed in USD or an agreed currency.

from $1,500 Discovery workshop
8–12 weeks Typical SP-API MVP
from $2,000/mo Support retainer

Plan your next SP-API release with us

Tell us about catalog size, marketplaces, internal systems, and SLAs—we’ll propose an architecture and milestone plan that fits how your team ships.