From the Decrees of the Council of Trent, which I would venture is a reliable source in this matter
Code:
DECREE CONCERNING INDULGENCES.
Whereas the power of conferring Indulgences was granted by Christ to the Church; and she has, even in the most ancient times, used the said power, delivered unto her of God; the sacred holy Synod teaches, and enjoins, that the use of Indulgences, for the Christian people most salutary, and approved of [Page 278] by the authority of sacred Councils, is to be retained in the Church; and It condemns with anathema those who either assert, that they are useless; or who deny that there is in the Church the power of granting them. In granting them, however, It desires that, in accordance with the ancient and approved custom in the Church, moderation be observed; lest, by excessive facility, ecclesastical discipline be enervated. And being desirous that the abuses which have crept therein, and by occasion of which this honourable name of Indulgences is blasphemed by heretics, be amended and corrected, It ordains generally by this decree, that all evil gains for the obtaining thereof,–whence a most prolific cause of abuses amongst the Christian people has been derived,–be wholly abolished. But as regards the other abuses which have proceeded from superstition, ignorance, irreverence, or from what soever other source, since, by reason of the manifold corruptions in the places and provinces where the said abuses are committed, they cannot conveniently be specially prohibited; It commands all bishops, diligently to collect, each in his own church, all abuses of this nature, and to report them in the first provincial Synod; that, after having been reviewed by the opinions of the other bishops also, they may forthwith be referred to the Sovereign Roman Pontiff, by whose authority and prudence that which may be expedient for the universal Church will be ordained; that this the gift of holy Indulgences may be dispensed to all the faithful, piously, holily, and incorruptly.
I hope this is sufficient for you, if not you might read the following
Decrees of the Council of Clovesho (747)
Decrees of the Council of Ravenna ( 1317)
both of which addressed the issue and preceded Trent by hundreds of years.
And look into the writing of Pope St. Pius V who in 1567 canceled all grants of indulgences involving any fees or other financial transactions.
If you still do not believe that these things happened then I don’t know what else to tell you. As I said if there was not a problem they would not have addressed it.
I don’t think that Trent was based on a desire to please Protestants and mollify them. If you have read the documents of that Counncil they come down very hard on Protestant beliefs and leave no room for doubt as to their intention.and beliefs in that matter .