Who is the merchant?
Ownership of funds, refunds, disputes and invoices determines whether you need direct payments, subscriptions or marketplace architecture.
Connect your UK checkout to the work behind it.
Checkout is a chain of money, tax, fulfilment and evidence—not a payment button. This cluster helps UK retailers, marketplaces and subscription businesses decide where platform defaults end and custom operational logic begins.
- 14
- guides & tools
- UK
- market-specific
- source
- linked at each claim
- 2015
- shipping since
Questions worth answering before you build
Architecture and operations for UK payments, ecommerce, tax, shipping and cross-border sales, grounded in production implementation choices.
What must reconcile?
Model the order, payment, tax, refund and fulfilment states as separate records joined by durable provider identifiers.
Where can fulfilment fail?
A paid order is not a shipped order. Carriers, stock, address quality and asynchronous webhooks need observable recovery paths.
Which border is crossed?
UK-only, Northern Ireland, EU and worldwide sales have different tax, customs, payment and customer-experience requirements.
Put the guidance into practice
- 01Make every money-moving webhook idempotent.
- 02Reconcile provider events against an internal ledger.
- 03Keep address, tax and fulfilment failures recoverable after payment.
- 04Confirm regulatory and tax positions with qualified advisers.
Related guides and tools
Each guide states what the cited source supports, what still needs product or professional judgement, and how the integration fails in practice.
Making Tax Digital
Building HMRC MTD for Income Tax software
Choose build, integration or buy, then design OAuth, fraud headers, obligations, submissions and reconciliation as explicit controls.
Read the guide →Marketplace paymentsStripe Connect architecture for a UK marketplace
Choose the charge route from the commercial model, then reconcile fees, transfers, refunds, disputes and payouts in an internal ledger.
Read the guide →WooCommerceWhy WooCommerce scheduled imports fail
Make product, price and stock feeds reliable with immutable snapshots, idempotent batches, reconciliation and operator-owned recovery.
Read the guide →Free toolUK late payment interest calculator
Calculate statutory interest and fixed compensation for an overdue business invoice and prepare a draft payment request.
Use the tool →Free toolMaking Tax Digital for Income Tax checker
See if and when MTD for Income Tax applies to a sole trader or landlord, with a countdown and an exportable quarterly deadline calendar.
Use the tool →Free toolEU charger label generator
Prepare draft charging labels and charger-inclusion pictograms for covered products sold into the EU.
Use the tool →Cross-borderSelling from the UK to the EU: ecommerce requirements
Route GB, Northern Ireland and EU-stock orders through the right VAT, customs, origin, product and fulfilment evidence.
Read the guide →PaymentsWhich Stripe payment methods should a UK business enable?
Decide between cards, wallets, PayPal, Klarna and Bacs with a four-gate model and a real recurring-billing limitation.
Read the guide →ShopifyBulk-edit a Shopify catalogue with the Admin API
Change prices, metafields, tags and redirects across thousands of products via the Admin API and AI, with a dry run, a JSONL snapshot and rollback.
Read the guide →ShopifyConnect a Shopify theme to Git and an AI agent
Version-control a premade or custom theme and ship features, fixes, SEO and GEO through reviewed, reversible pull requests.
Read the guide →FulfilmentRoyal Mail Click & Drop with WooCommerce
Build a reliable native connection with explicit import eligibility, a handoff score, exception monitoring and a clear API threshold.
Read the guide →PaymentsStripe webhooks end to end
A production pattern for signatures, idempotency, retries, event ordering and reconciliation.
Read the guide →TicketingWhen custom ticketing beats platform fees
The ownership, payment and operational trade-offs behind a UK event platform build.
Read the guide →MarketplaceAnatomy of a B2B marketplace MVP
The features and operational decisions that dominate a wholesale marketplace budget.
Read the guide →These pages provide technical and operational guidance, not legal, tax, financial or compliance advice. Confirm regulated decisions with an appropriately qualified UK adviser.
Explore all UK insight clusters →