Custom Shopify theme or template: how to decide
What changes between adapting an existing theme and building your own, and what to check before choosing for your Shopify store.
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Selling on Amazon, TikTok Shop and Miravia from Shopify requires deciding how catalogue, availability and orders are shared. No universal connector guarantees identical operations across every channel.
First assign an authoritative source for each data field. It may be Shopify, an ERP or PIM; what matters is avoiding two systems overwriting the same price or stock without clear rules.
Start with one channel and a controlled catalogue if these processes remain undefined. Opening several destinations simultaneously multiplies test cases.
Shopify Marketplace Connect, formerly Codisto, includes Amazon among supported marketplaces. Do not present them as independent apps or assume an older integration retains the same name and scope.
Review SKU and ASIN matching, catalogue, prices and logistics. If using FBA and self-fulfilment, define availability for each operation. The Shopify and Amazon article covers that specific connection.
The TikTok Shop setup guide includes Spain and lists store and product requirements. Connection synchronises operational areas but needs verification and configuration.
TikTok Shop payments and payouts follow TikTok rules; check who collects money, how payouts arrive and return handling. Do not confuse the sales channel with enabling advertising or a pixel.
If this is your first social channel, also read the TikTok Shop integration guide before expanding the catalogue.
Review business admission and current connector capabilities. A tool submitting a feed may not cover orders, shipments or returns identically.
Request written country, catalogue, attribute, pricing, stock, order and status coverage. Check additional plans and documented latency or frequency. Do not apply a fixed “fifteen-minute” interval to every project.
| Data | Decision | Test |
|---|---|---|
| Identifier | Match SKU, variant and channel item | An order arrives with the correct item |
| Price | Source and marketplace rules | Consistent amount, taxes and promotion |
| Availability | Source, reservation and safety buffer if appropriate | Last unit and delayed update |
| Order | Operational destination and duplicate prevention | Retry without two fulfilments |
| Return | Authorising channel and restocking system | Consistent status and quantities |
Information may travel asynchronously. Design alerts and recovery procedures instead of promising perfect stock from connecting platforms.
Compare fees, promotions, logistics, returns and connector costs. Do not set one universal price increase for every marketplace: costs depend on category, contract and operations.
Also define how to avoid incompatible promotions or prices below acceptable margin. Bulk changes need a way to preview and check items before publishing.
Include warehouse and customer service. An order appearing in Shopify does not mean staff know every marketplace's rules.
Record rejected products, blocked orders, stock cancellations and resolution times. Review channel margin after incidents and returns, alongside turnover.
If operating your own marketplace, the Mirakl and Shopify guide covers a different project. For physical-store coordination, see omnichannel inventory.
We can help organise architecture, connectors and testing through Shopify integration consulting.
Editorial review: the Migraciones.io team · 30 October 2026. Features, plans and availability are checked against the linked sources.