Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) got cupped and paid the wage; had he (peace and blessings be upon him) considered it unlawful, he would not have paid it.
The narration of Muhammad bin Sirin from Ibn Abbas is mursal (its chain is broken).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19516