Any checkin embed has "Checking ####" in the footer. Globally listen for the toast reaction and respond with a toast (PM user?):
@commands.Cog.listener()
async def on_reaction_add(reaction, adder): #reaction.message sis the message being reacted to, adder is the User
message.embeds -- returns a list of embeds
embed.footer() returns the footer contents
From there, use toast
Any checkin embed has "Checking ####" in the footer. Globally listen for the toast reaction and respond with a toast (PM user?):