Greetings Magister Ventrue ,I want to upgrade for one month,however I dont want the second month to automatically come out as its not my credit card.How can I pay for one month and thats it?

HS/9
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"It doesnt matter how many glasses of beer a boy can down,but how many blows he can take;it doesnt matter how many nights out he can take,but how many kilometres he can march."