take your letter to the child care immediately - they may be able to back date it, and have that $200 you've paid come off part of your future bill (so apply ccb to what you've paid, and put you in credit if that makes sense)

if they refuse (which unfortunately some do) they'll report that you paid full fees and you'll get your ccb for that time at tax time

my understanding is that most child care providers will backdate CCB for up to 4 weeks - so would process it and the amount of CCB you'd get would be credited to your next bill BUT the change over in reporting systems means they now report weekly (or some do) and may not be able to. if they don't/can't, you will definitely get that amount back at tax time