Update decimal places and max digits

Supercedes dj-stripe#1786

djstripe/fields.py

@@ -112,11 +112,8 @@ class StripeDecimalCurrencyAmountField(FieldDeconstructMixin, models.DecimalFiel
     """
 
     def __init__(self, *args, **kwargs):
-        """
-        Assign default args to this field. By contacting stripe support, some accounts
-        will have their limit raised to 11 digits
-        """
-        defaults = {"decimal_places": 2, "max_digits": 11}
+        # see https://github.com/dj-stripe/dj-stripe/pull/1786
+        defaults = {"decimal_places": 2, "max_digits": 14}
         defaults.update(kwargs)
         super().__init__(*args, **defaults)
 

djstripe/models/billing.py

@@ -1198,8 +1198,8 @@ class InvoiceItem(StripeModel):
     unit_amount_decimal = StripeDecimalCurrencyAmountField(
         null=True,
         blank=True,
-        max_digits=19,
-        decimal_places=12,
+        max_digits=djstripe_settings.decimal_max_digits,
+        decimal_places=djstripe_settings.decimal_places,
         help_text=(
             "Same as `unit_amount`, but contains a decimal value with "
             "at most 12 decimal places."
@@ -1526,8 +1526,8 @@ class Plan(StripeModel):
     amount_decimal = StripeDecimalCurrencyAmountField(
         null=True,
         blank=True,
-        max_digits=19,
-        decimal_places=12,
+        max_digits=djstripe_settings.decimal_max_digits,
+        decimal_places=djstripe_settings.decimal_places,
         help_text=(
             "The unit amount in cents to be charged, represented as a decimal "
             "string with at most 12 decimal places."

djstripe/models/core.py

@@ -2282,8 +2282,8 @@ class Price(StripeModel):
     unit_amount_decimal = StripeDecimalCurrencyAmountField(
         null=True,
         blank=True,
-        max_digits=19,
-        decimal_places=12,
+        max_digits=djstripe_settings.decimal_max_digits,
+        decimal_places=djstripe_settings.decimal_places,
         help_text=(
             "The unit amount in cents to be charged, represented as a decimal "
             "string with at most 12 decimal places."

djstripe/settings.py

@@ -62,6 +62,14 @@ def get_idempotency_key(self):
             "DJSTRIPE_IDEMPOTENCY_KEY_CALLBACK", self._get_idempotency_key
         )
 
+    @property
+    def decimal_max_digits(self):
+        return 24
+
+    @property
+    def decimal_places(self):
+        return 12
+
     @property
     def DJSTRIPE_WEBHOOK_URL(self):
         return getattr(settings, "DJSTRIPE_WEBHOOK_URL", r"^webhook/$")