Prepayd or Prepaid: How To spell?

The word Prepayd is misspelled against Prepaid, which is past tense of "Prepay"

Word contains consecutive vowels 'AI' in between alphabets prep & d is misspelled as 'AY'
Wrong Spelling:  prep-ay-d 
Correct Spelling:  prep-ai-d 
Explore spell check of Prepaid to spell without errors.

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