Invalid FixedBillingDateDay on API Customer Subscription

I have an application that uses the API route (https://support.billsby.com/reference/create-a-subscription-for-a-new-customer). It was working OK until now, but I haven't changed anything and the API is now returning the following error: { ["code"]=> string(40) "Subscription_Create_Invalid_PricingModel" ["name"]=> NULL ["description"]=> string(27) "Invalid FixedBillingDateDay" } The pricing model configured by the Billsby's panel is: ["pricingModel"]=> object(stdClass)#90 (16) { ["price"]=> int(1359) ["priceFormatted"]=> string(12) "$13.59 (AUS)" ["pricingModelId"]=> int(35271) ["frequency"]=> int(1) ["frequencyType"]=> string(6) "Weekly" ["freeTrial"]=> int(1) ["freeTrialFrequencyType"]=> string(6) "Weekly" ["contractTerm"]=> NULL ["contractTermFrequencyType"]=> string(10) "Unassigned" ["setupFeePrice"]=> NULL ["setupFeePriceFormatted"]=> NULL ["freeQuantity"]=> int(0) ["billingDateType"]=> string(17) "FixedDayOfTheWeek" ["fixedBillingDateDay"]=> int(7) ["fixedBillingDateMonth"]=> NULL ["proRateOption"]=> string(25) "DoNotChargeUntilNextCycle" } Can anyone help me with this issue?
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