When the Prophet ﷺ was cupped, he paid the man who cupped him his wages.  

احْتَجَمَ النَّبِيُّ ﷺ وَأَعْطَى الْحَجَّامَ أَجْرَهُ  

When the Prophet ﷺ was cupped, he paid the man who cupped him his wages. If it had been undesirable he would not have paid him.  

احْتَجَمَ النَّبِيُّ ﷺ وَأَعْطَى الْحَجَّامَ أَجْرَهُ وَلَوْ عَلِمَ كَرَاهِيَةً لَمْ يُعْطِهِ  

The Prophet ﷺ used to get cupped and would never withhold the wages of any person .  

سَمِعْتُ أَنَسًا ؓ يَقُولُ كَانَ النَّبِيُّ ﷺ يَحْتَجِمُ وَلَمْ يَكُنْ يَظْلِمُ أَحَدًا أَجْرَهُ