SHOPIFY APP DEVELOPMENT

Australian Shopify brands hitting the ceiling of what the App Store can do need custom apps — for MYOB sync, checkout rules, and click-and-collect booking

Ignited Nepal builds custom Shopify apps for Australian merchants who have outgrown the App Store: MYOB and Pronto Xi integrations, timed click-and-collect booking systems, Shopify Functions-based B2B pricing logic, and POS loyalty extensions. When existing apps cannot be configured to match your business rules, custom development is the answer.

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/ This is for you if

This service is for Australian Shopify merchants and Shopify Plus operators who have a specific functional requirement that no existing App Store app meets.

Retailers using MYOB Advanced or Pronto Xi that have no maintained, working Shopify connector

Multi-location retailers who need timed click-and-collect slot booking integrated with Shopify inventory

Australian trade brands that need B2B pricing tiers by account, category, or volume that exceed what standard wholesale apps provide

Shopify Plus brands that need checkout customisation — custom fields, delivery instructions, or order rules — that requires Shopify Functions

Shopify merchants using Shopify POS for in-store sales who want loyalty points to earn automatically at the point of sale

/ What's broken

Four Shopify limitations common to Australian merchants that the App Store cannot resolve

MYOB or Pronto Xi is not syncing with Shopify

MYOB Advanced and Pronto Xi are widely used by mid-market Australian businesses, but neither has a maintained, fully functional Shopify connector in the App Store. The available third-party connectors are generic and often fail on edge cases specific to Australian tax handling (GST), Australian customer account structures, or the specific version of MYOB or Pronto the merchant is running. A custom integration using Shopify's Admin API for order, inventory, and customer data sync, combined with the ERP's own API or data export format, provides a reliable bi-directional data connection that a generic connector cannot deliver.

Click-and-collect slot booking is not available as a standard Shopify feature

Australian retail customers increasingly expect to reserve a specific pickup time when buying online for in-store collection. Shopify has no built-in click-and-collect slot booking system, and available apps offer basic click-and-collect toggles without timed slot management, store inventory availability checks, or calendar-based slot allocation. A custom app that integrates with the merchant's store inventory by location, presents available pickup time slots at checkout, and blocks slots once capacity is reached requires custom development using Shopify's Delivery Customisation API and a backend slot management system.

B2B pricing tiers for Australian trade accounts require more than wholesale apps provide

Australian trade brands selling to architects, builders, interior designers, or retail resellers need pricing rules that go beyond what standard Shopify wholesale apps offer. Volume tier pricing by SKU, category-level discount structures, account-specific price lists, and minimum order rules by product category require Shopify Functions-based custom pricing logic. Shopify Functions runs at the checkout level and can apply complex pricing transformations that no app-based discount stack can replicate without performance overhead or rule conflicts.

Shopify POS loyalty integration does not work across online and in-store channels

Australian merchants using Shopify POS for in-store sales and a loyalty programme for online customers find that loyalty points earned in-store do not automatically flow to the customer's loyalty account. Standard loyalty apps integrate with Shopify's online checkout but do not have working POS extensions that trigger point earning at the physical point of sale. A custom Shopify POS app extension that hooks into the POS sale event, calls the loyalty programme's API, and awards points at the time of in-store purchase requires custom development.

/ What we engineer

Custom Shopify app development for Australian merchants and Shopify Plus operators

Each workstream is built by the team that audits it, and wired into the rest of your growth system.

MYOB and Pronto Xi Integration Apps

We build custom Admin API integrations that sync Shopify orders, customers, inventory, and product data with MYOB Advanced and Pronto Xi. The integration is built to the specific version and configuration of the ERP the merchant is running, with Australian GST handling and the merchant's existing account code structure included in the data mapping.

Click-and-Collect Slot Booking Systems

We build custom click-and-collect apps that present timed pickup slots at Shopify checkout using the Delivery Customisation API, check available inventory at the pickup location in real time, block sold-out slots, and send booking confirmation emails with the collection details. For multi-store merchants, the app routes each booking to the correct store location.

Shopify Functions Pricing Apps

We build custom Shopify Functions applications for B2B pricing rules that exceed standard wholesale app capabilities: volume tier pricing, account-specific price lists, category-level discounts, and conditional minimum order rules. Shopify Functions run in Shopify's infrastructure and apply pricing at the checkout level without third-party app latency.

Shopify POS App Extensions

We build custom Shopify POS app extensions that integrate loyalty programmes, gift card systems, and customer account tools with the Shopify POS interface. POS extensions appear directly in the Shopify POS app on the merchant's iPad or terminal and trigger loyalty API calls at the time of in-store sale.

Shopify Flow Custom Automations

We configure and build Shopify Flow automations for order routing, fulfilment triggers, customer tagging, and operational notifications. Where Flow's native connectors are insufficient, we build custom Flow actions using the Flow app API.

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/ What changes

What your Shopify operations look like after custom app development

Before
After
BeforeMYOB Advanced and Pronto Xi are widely used by mid-market Australian businesses, but neither has a maintained, fully functional Shopify connector in the App Store. The available third-party connectors are generic and often fail on edge cases specific to Australian tax handling (GST), Australian customer account structures, or the specific version of MYOB or Pronto the merchant is running. A custom integration using Shopify's Admin API for order, inventory, and customer data sync, combined with the ERP's own API or data export format, provides a reliable bi-directional data connection that a generic connector cannot deliver.
AfterERP sync runs without manual intervention. Orders placed on Shopify appear in MYOB or Pronto Xi automatically. Inventory changes in the ERP update Shopify stock levels without a spreadsheet import. Customer records stay consistent across both systems.
BeforeAustralian retail customers increasingly expect to reserve a specific pickup time when buying online for in-store collection. Shopify has no built-in click-and-collect slot booking system, and available apps offer basic click-and-collect toggles without timed slot management, store inventory availability checks, or calendar-based slot allocation. A custom app that integrates with the merchant's store inventory by location, presents available pickup time slots at checkout, and blocks slots once capacity is reached requires custom development using Shopify's Delivery Customisation API and a backend slot management system.
AfterClick-and-collect works as buyers expect. Customers choose a pickup time at checkout. Slots fill up automatically. Your store team sees confirmed bookings for each time slot with order details. No phone calls to confirm collection times.
BeforeAustralian trade brands selling to architects, builders, interior designers, or retail resellers need pricing rules that go beyond what standard Shopify wholesale apps offer. Volume tier pricing by SKU, category-level discount structures, account-specific price lists, and minimum order rules by product category require Shopify Functions-based custom pricing logic. Shopify Functions runs at the checkout level and can apply complex pricing transformations that no app-based discount stack can replicate without performance overhead or rule conflicts.
AfterTrade customers see their correct pricing. B2B account holders see their tier pricing, their minimum order requirements, and their account-specific terms when they log in and shop. Pricing rules apply at checkout without overrides or manual adjustments from your sales team.
BeforeAustralian merchants using Shopify POS for in-store sales and a loyalty programme for online customers find that loyalty points earned in-store do not automatically flow to the customer's loyalty account. Standard loyalty apps integrate with Shopify's online checkout but do not have working POS extensions that trigger point earning at the physical point of sale. A custom Shopify POS app extension that hooks into the POS sale event, calls the loyalty programme's API, and awards points at the time of in-store purchase requires custom development.
AfterLoyalty points earn in-store without staff intervention. A customer who earns points in-store at your Melbourne or Sydney location sees those points reflected in their loyalty account immediately after the sale. Your loyalty programme works as a single programme across online and in-store channels.

/ How it works

How we build custom Shopify apps for Australian merchants

  1. Technical Scoping Week 1

    We document the functional requirement in detail, identify the Shopify API extension point the app requires (Admin API, Storefront API, Shopify Functions, Delivery Customisation API, or POS App Extensions), and map the data flows between Shopify and any external system (MYOB, Pronto, loyalty platform, or slot management backend). We produce a technical specification before any build work begins.

  2. Architecture and Environment Setup Weeks 1-2

    We configure the development environment using Shopify CLI, set up the app in the Shopify Partner Dashboard, establish staging environments for both Shopify and any connected third-party systems, and confirm API access credentials and data mapping with the merchant's ERP or platform team.

  3. Core Build Weeks 2-6, depending on scope

    We build in incremental stages with testable milestones. For ERP integrations, this includes building the data mapping layer, the sync logic, and the error handling for API failures. For Shopify Functions builds, this includes writing and deploying the Function in Rust or JavaScript and testing pricing logic against a range of checkout scenarios. For POS extensions, this includes building and testing the extension in a physical or emulated Shopify POS environment.

  4. Integration and User Acceptance Testing Weeks 6-7

    We test the complete workflow end to end using real-world data scenarios relevant to the merchant's business. For ERP integrations, we run parallel processing tests where the same orders flow through both the manual process and the new integration simultaneously. For click-and-collect builds, we test slot filling, inventory checks, and overbook prevention across all store locations.

  5. Deployment and Handover Week 7-8

    We deploy to production, configure the app in the merchant's Shopify admin, and deliver documentation covering how the app works, what to monitor, and how to handle exceptions. A handover session is included. Post-launch support is included for 30 days.

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/ Common questions

FAQ

Straight answers on scope, timelines and cost. Anything else, ask us directly.

Ask us directly
How do I integrate MYOB with Shopify for order and inventory sync?

MYOB Advanced integration with Shopify requires a custom app using Shopify's Admin API because no maintained, fully functional connector for MYOB Advanced exists in the Shopify App Store for Australian merchants. The integration uses Shopify's Orders API to pull new orders and send them to MYOB via MYOB's REST API or file-based import format, depending on the MYOB Advanced configuration. Inventory sync uses Shopify's Inventory API to update stock levels in Shopify when MYOB registers a stock receipt or adjustment. The data mapping must account for Australian GST handling, Shopify's line item tax structure, and the MYOB account codes specific to the merchant's chart of accounts. Pronto Xi follows the same approach using Pronto's API or database-level integration depending on what the Pronto installation exposes.

How do I build a click-and-collect slot booking system on Shopify?

A timed click-and-collect booking system on Shopify requires a custom app using Shopify's Delivery Customisation API, which allows a custom app to inject additional delivery options at checkout. The app presents pickup time slots as delivery options, checks available inventory at the selected pickup location using Shopify's Inventory API, and blocks slots that have reached capacity. A backend database stores slot capacity and bookings per store and per time window. Booking confirmation is sent by Shopify's order confirmation email or a custom notification. For multi-location merchants, the app routes each booking to the store selected at checkout. This capability is not available through standard Shopify apps or through Shopify's native Local Delivery feature.

What is Shopify Functions and when do I need it for custom B2B pricing in Australia?

Shopify Functions is Shopify's system for running custom business logic directly in Shopify's checkout infrastructure, replacing the deprecated Shopify Scripts. It is needed for Australian B2B pricing when the pricing rules required cannot be expressed as a flat discount, a percentage discount, or a simple price list that a standard wholesale app can manage. Examples that require Shopify Functions include: volume tier pricing that changes the unit price based on quantity ordered per line item, account-specific price lists that apply different prices to different trade customer segments, conditional minimum order rules by product category, and multi-condition promotional logic that depends on more than one cart attribute simultaneously. Shopify Functions require a developer to write the logic in Rust or JavaScript and deploy it through the Shopify CLI. They are available on all Shopify plans but are most commonly used by Shopify Plus merchants.

How do I build a custom Shopify POS extension for loyalty programme integration?

A custom Shopify POS extension is a React-based app extension that appears in the Shopify POS interface on the merchant's device and can interact with the active POS cart and sale. For loyalty integration, the POS extension hooks into the POS checkout event, reads the customer record attached to the sale, calls the loyalty programme's API with the sale amount and customer identifier, and awards the correct points. The extension can also display the customer's current points balance to the POS operator during the sale. Building a POS extension requires access to Shopify's POS App Extension API, which is part of Shopify's app development toolkit, and a working integration with the loyalty programme's API. The extension is installed on the POS device as part of the custom Shopify app and does not require manual steps from the store staff.

What Shopify plan is required for custom checkout apps in Australia?

Shopify Functions, which are required for custom checkout pricing logic, are available on all Shopify plans, but deploying a custom Shopify app with checkout UI extensions and Delivery Customisation API access typically requires Shopify Advanced or Shopify Plus in Australia. Shopify Plus is required for full checkout extensibility through Checkout Extensions, including custom fields, delivery instruction inputs, and multi-step checkout modifications. Third-party calculated shipping rates, which are required for custom click-and-collect and carrier rate apps, are available on Shopify Advanced and Shopify Plus plans. Merchants on lower Shopify plans can access some Admin API functionality through custom private apps, but checkout-level customisation is restricted to Advanced and Plus.

/ Our team

The people behind the work.

Not a black box. Real specialists you can call, with their names on the work.

About us
Hawrry Bhattarai

Hawrry Bhattarai

Google Ads Expert

LinkedIn

Start here

If the App Store does not have it and your business rules cannot be simplified to fit what is available, we build the app.

Ignited Nepal works with Australian Shopify merchants and Shopify Plus operators on custom app development projects from technical scoping through to deployment and post-launch support. We build using Shopify's approved developer tools and APIs, and we document everything so your team can manage the app after handover.

Request an App Development Brief View the evidence