Change for optional value amount

Author: thiagozs

examples/main.go

@@ -8,12 +8,9 @@ import (
 
 func main() {
 	opts := []pix.Options{
-		pix.OptPixKey("28707746806"),
-		pix.OptDescription("Teste"),
+		pix.OptPixKey("11999821234"),
 		pix.OptMerchantName("Thiago Zilli Sarmento"),
 		pix.OptMerchantCity("Ararangua"),
-		pix.OptAmount("1.00"),
-		pix.OptAditionalInfo("gerado por go-pixgen"),
 		pix.OptKind(pix.STATIC),
 	}
 

pix/pix.go

@@ -41,28 +41,33 @@ func (p *Pix) GenPayload() string {
 			p.getValue(TAG_INIT_METHOD, "11"),
 			p.getValue(TAG_MAI, p.generateMAI()),
 			p.getValue(TAG_MCC, "0000"),
-			p.getValue(TAG_TRANSACTION_CURRENCY, "986"),
-			p.getValue(TAG_TRANSACTION_AMOUNT, p.params.amount),
-			p.getValue(TAG_COUNTRY_CODE, "BR"),
+			p.getValue(TAG_TRANSACTION_CURRENCY, "986")}
+		if len(p.params.amount) > 0 {
+			tags = append(tags, p.getValue(TAG_TRANSACTION_AMOUNT, p.params.amount))
+		}
+		tags = append(tags, p.getValue(TAG_COUNTRY_CODE, "BR"),
 			p.getValue(TAG_MERCHANT_NAME, p.params.merchant.name),
 			p.getValue(TAG_MERCHANT_CITY, p.params.merchant.city),
 			p.getValue(TAG_ADDITIONAL_DATA, p.generateAdditionalData()),
 			p.getValue(TAG_CRC, "0000"),
-		}
+		)
 	case DYNAMIC:
 		tags = []string{
 			p.getValue(TAG_INIT, "01"),
 			p.getValue(TAG_INIT_METHOD, "11"),
 			p.getValue(TAG_MAI, p.generateMAI()),
 			p.getValue(TAG_MCC, "0000"),
 			p.getValue(TAG_TRANSACTION_CURRENCY, "986"),
-			p.getValue(TAG_TRANSACTION_AMOUNT, p.params.amount),
-			p.getValue(TAG_COUNTRY_CODE, "BR"),
+		}
+		if len(p.params.amount) > 0 {
+			tags = append(tags, p.getValue(TAG_TRANSACTION_AMOUNT, p.params.amount))
+		}
+		tags = append(tags, p.getValue(TAG_COUNTRY_CODE, "BR"),
 			p.getValue(TAG_MERCHANT_NAME, p.params.merchant.name),
 			p.getValue(TAG_MERCHANT_CITY, p.params.merchant.city),
 			p.getValue(TAG_ADDITIONAL_DATA, p.generateAdditionalData()),
 			p.getValue(TAG_CRC, "0000"),
-		}
+		)
 	}
 
 	payload := strings.Join(tags, "")