diff --git a/facho/fe/form.py b/facho/fe/form.py
index e1d3de5..5b1e34e 100644
--- a/facho/fe/form.py
+++ b/facho/fe/form.py
@@ -88,10 +88,14 @@ class Price:
 
 @dataclass
 class PaymentMean:
-    id: str
-    code :str
-    due_at: datetime
-    payment_id: str
+    DEBIT = '01'
+    CREDIT = '02'
+    
+    def __init__(self, id: str, code: str, due_at: datetime, payment_id: str):
+        self.id = id
+        self.code = code
+        self.due_at = due_at
+        self.payment_id = payment_id
 
         
 @dataclass
@@ -175,8 +179,8 @@ class Invoice:
     def set_customer(self, party: Party):
         self.invoice_customer = party
 
-    def set_payment_mean_debit(self, payment_id, code, due_at):
-        self.invoice_payment_mean = PaymentMean('01', code, due_at, payment_id)
+    def set_payment_mean(self, payment_mean: PaymentMean):
+        self.invoice_payment_mean = payment_mean
 
     def add_invoice_line(self, line: InvoiceLine):
         self.invoice_lines.append(line)
diff --git a/tests/test_fe_form.py b/tests/test_fe_form.py
index 511fade..09860ec 100644
--- a/tests/test_fe_form.py
+++ b/tests/test_fe_form.py
@@ -20,7 +20,7 @@ def simple_invoice_without_lines():
     inv.set_period(datetime.now(), datetime.now())
     inv.set_issue(datetime.now())
     inv.set_ident('ABC123')
-    inv.set_payment_mean_debit('1234', '41', datetime.now())
+    inv.set_payment_mean(form.PaymentMean(form.PaymentMean.DEBIT, '41', datetime.now(), '1234'))
     inv.set_supplier(form.Party(
         name = 'facho-supplier',
         ident = 123,
@@ -43,7 +43,7 @@ def simple_invoice():
     inv.set_period(datetime.now(), datetime.now())
     inv.set_issue(datetime.now())
     inv.set_ident('ABC123')
-    inv.set_payment_mean_debit('1234', '41', datetime.now())
+    inv.set_payment_mean(form.PaymentMean(form.PaymentMean.DEBIT, '41', datetime.now(), ' 1234'))
     inv.set_supplier(form.Party(
         name = 'facho-supplier',
         ident = 123,