This is the 10886th most frequent French word.
paiera
"Paiera" means "will pay" (third person singular future tense of the verb "payer").
In this sentence, 'paiera' is used in the future tense to describe an action that he will perform, that of paying for the restaurant in the future.
Il paiera le restaurant ce soir.
He will pay for the restaurant tonight.
Here, 'paiera' is again in the future tense but now refers to the action of settling debts in the upcoming year.
Elle paiera ses dettes l'année prochaine.
She will pay her debts next year.
This example uses 'paierons', the conjugation of the verb in the first person plural future tense, to describe a future action concerning payment.