Started developing this, hopefully it will be quick

fatQR.go

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+package gofatqr
+
+// TODO
+// Check what we can take form SAF-T to put here, maybe work on a SAF-T
+// implementation too, who knows amirite
+
+import (
+	"fmt"
+	"math/big"
+	"strings"
+	"time"
+)
+
+type FiscalSpace struct {
+	TaxCountryRegion        string   // 1 - fiscal space
+	TaxableBase             *big.Rat // 2
+	TaxabledReduced         *big.Rat // 3
+	VatTotalReducedTax      *big.Rat // 4
+	TaxableIntermediateBase *big.Rat // 5
+	VatTotalIntermediateTax *big.Rat // 6
+	TaxableNormalBase       *big.Rat // 7
+	VatTotalNormalBase      *big.Rat // 8
+}
+
+type FatQR struct {
+	TaxRegistrationNumber     string      // A
+	CustomerTaxID             string      // B
+	Country                   string      // C - customer country
+	InvoiceType               string      // D
+	InvoiceStatus             bool        // E
+	InvoiceDate               time.Time   // F
+	InvoiceNo                 string      // G
+	ATCUD                     string      // H
+	IFiscalSpace              FiscalSpace // I1 - I8
+	JFiscalSpace              FiscalSpace // I1 - I8
+	KFiscalSpace              FiscalSpace // I1 - I8
+	NotTaxable                *big.Rat    // L
+	StampDuty                 *big.Rat    // M - "Imposto de Selo"
+	TaxPayable                *big.Rat    // N
+	GrossTotal                *big.Rat    // O
+	WithholdingTaxAmount      *big.Rat    // P
+	HashQuartet               string      // Q
+	SoftwareCertificateNumber int         // R
+	OtherInfo                 string      // S
+}
+
+type part struct {
+	key   string
+	value string
+}
+
+func (fq *FatQR) scanParts(parts []string) error {
+	fmt.Println(parts)
+
+	for k := range parts {
+		keyValuePair := strings.Split(parts[k], ":")
+		if len(keyValuePair) != 2 {
+			return fmt.Errorf("failed to parse key value pair: %s", parts[k])
+		}
+	}
+
+	return nil
+}
+
+func (fq *FatQR) Scan(s string) error {
+	parts := strings.Split(s, "*")
+
+	fq.scanParts(parts)
+
+	return nil
+}
+
+func (fq *FatQR) String() string {
+	return ""
+}

fatQR_test.go

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+package gofatqr
+
+import (
+	"testing"
+)
+
+func TestScan(t *testing.T) {
+	testStr := "A:513847588*B:239752988*C:PT*D:FS*E:N*F:20250828*G:FS 437251001/115666*H:0*I1:PT*I7:37.94*I8:8.73*N:8.73*O:46.67*Q:mWUp*R:0177"
+
+	var qr FatQR
+	err := qr.Scan(testStr)
+	if err != nil {
+		t.Errorf("Should not have occurred an error for: %s, %+v", testStr, err)
+	}
+}

go.mod

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+module gofatqr
+
+go 1.24.6

main.go

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+package gofatqr
+
+func Parse(data string) {
+}