Is there anything incumbent upon me regarding the clients for whom I created electronic wallets, having received their gifts, being ignorant of any suspicion or prohibition in that, and is this money unlawful, and what should I do now?

The ignorance of the questioner regarding taking the gifted amount from the company does not absolve him of sin. However, the rights of the wallet owners are a debt on him that must be returned to them, or he must seek their forgiveness, based on the hadith: "On the hand is what it took until it fulfills it," and because the financial and blood rights of human beings do not fall away due to ignorance.

Usurpation is forbidden by the Qur'an, Sunnah, and consensus. Whoever usurps something is obligated to return it. If returning it is impossible due to inability to reach its owners, he should donate it on their behalf or spend it on the welfare of Muslims. If the impossibility is due to not possessing the money, he should pay what is easy for him, seek forgiveness from the owners, pray for them, and perform many good deeds.