GoCardless's day_of_month subscription parameter only accepts 1–28 — full stop, no month-aware rounding on their end. The plugin's UI enforces the same 1–28 range for that reason; there's no way to ask for "always the 31st" or "last day [...]
BACS is the one scheme that doesn't support the day_of_month / month subscription parameters at all. For every other scheme (SEPA Core, ACH, BECS, PAD, Autogiro, Betalingsservice…), the plugin sends day_of_month (and month, for yearly) directly in the subscription-create [...]
No, and this is deliberate rather than a bug. A trial delay (trial_days) determines the subscription's start date by itself; a day/month preference is a separate, incompatible way of pinning the start date. The plugin's form builder hides the [...]
Weekly: 1–104 (so "every 104 weeks" is valid, "every 105" isn't). Monthly: 1–24 — and note this supports any value in that range, not just 1, so "every 3 months" (quarterly) and "every 6 months" (semi-annual) are both entirely [...]
No — when a form uses "customer chooses" for billing frequency (offering Weekly/Monthly/Annually as a choice on the form), the resulting subscription is always billed every 1 unit of whatever they pick, with no day-of-month preference applied. The day/month [...]