One thing we have learned over the years is that science is unpredictable and delays to projects happen all the time: be that through customs delays, project initiation delays, patient recruitment delays etc. For this reason, we implement as standard a pay-as-you-go invoicing process whereby you are charged for the max number of samples you stored with us the previous month, irrelevant of how many you thought were going to arrive with us. Unfortunately, as standard, we are unable to pro-rata our invoices to the day number (i.e. if they arrived on the 29th of a month it would still count). We do not implement monthly monitoring fees until you deposit your first samples with us, even if the contract is signed.