OngoingAI

Usage & market intelligence

Store usage data is not available for this app.

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Pricing
Free trial available
Free
Estimated monthly cost
  • • 50 orders/month included
  • • $0.10 per extra order
  • • Stock sync & tracking push
  • • GoBD & ZUGFeRD invoices
  • • All features in all plans included
Starter
Estimated monthly cost
14-day free trial
  • • 500 orders/month included
  • • $0.06 per extra order
  • • Stock sync & tracking push
  • • GoBD & ZUGFeRD invoices
  • • All features in all plans included
Growth
Estimated monthly cost
14-day free trial
  • • 1,500 orders/month included
  • • $0.04 per extra order
  • • Stock sync & tracking push
  • • GoBD & ZUGFeRD invoices
  • • All features in all plans included
Business
Estimated monthly cost
14-day free trial
  • • 5,000 orders/month included
  • • $0.034 per extra order
  • • Stock sync & tracking push
  • • GoBD & ZUGFeRD invoices
  • • All features in all plans included
What does Billstack do?

Connect Shopify to Billstack: real-time order import, GoBD-compliant invoices (ZUGFeRD), stock sync and shipping — built for merchants in Germany & the EU.

  • Real-time order import via webhooks, incl. addresses and payment status
  • Automatic, legally compliant invoices (ZUGFeRD e-invoicing, GoBD)
  • Product catalog import and continuous stock sync (Billstack as stock master)
  • Tracking numbers pushed back to Shopify automatically
  • Multi-channel: eBay, Amazon, Etsy, Kaufland, OTTO, Shopware in one back office

Features

Inventory syncOrdersPricesProduct detailsVariantsSKUsBarcodesMulti-channelMulti-storeAutomaticManualBulkReal-timeScheduledCustomAutomated alertsCustom notificationsOrder updatesEmail alertsError reportsHistorical reportsInventory alertsLow stock alertsData import and exportPerformance metricsReal-time statusDetailed logsERPCustom workflowsMulti-platform managementAutomated fulfillmentDelivery managementBatch processingOrder editingStatus updatesOrder syncReal-time syncMulti-locationBatch trackingExpiry dates
Review history
Daily review count on the Shopify App Store
0±0 · 30d· Rating steady at 0.0★

Daily tracking from Aug 10, 2026 through today · 30 days observed · sign up free for the full history →

Category rankings
Live organic position on Shopify App Store category pages
  • ERP
    #79▲15
  • Inventory sync
    #241▼3

Tracked daily · last 28 days · as of 2026-09-25

Catalog position
Within Inventory sync on the App Store
Rank by reviews
#393 of 469
Review percentile
16th
Rating percentile
56th
On the App Store
0.2 yrs
Works with
Integrations listed for Billstack
AmazoneBayEtsyKauflandOTTOShopware
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Frequently asked questions

Connect Shopify to Billstack: real-time order import, GoBD-compliant invoices (ZUGFeRD), stock sync and shipping — built for merchants in Germany & the EU. It's a inventory sync tool for ecommerce stores.