Verifactu by Abakira

Verifactu invoicing for Spanish Shopify stores: every paid order becomes a simplified invoice, every refund a corrective invoice, each with its chained record and its tax QR code.

Numbered without gaps, chained by SHA-256, following the AEAT’s published specifications.
Refunds are corrected, never deleted: an R5 corrective invoice points to the original.
It refuses what it cannot get right: orders outside its scope are listed with the reason instead of being filed with a guess.

Install it from the Shopify App Store, then open it from Apps in your Shopify admin.