The striker made a surprise move to the UEFA Champions League holders on Deadline Day after leaving PSG last month.
Choupo-Moting claims PSG wanted him to stay but he could not turn down the chance to play for the Bundesliga giants.
"Paris wanted me to stay, but I turned them down. There were some interesting offers. My choice was made as soon as Bayern contacted my agents," Choupo-Moting said, as per Goal.
"It wasn't a shock they came in for me, but it's a huge honour.
"They're the Champions League holders, the biggest team in Germany. It's a great league. Munich is a beautiful city. I am super happy."
4. Miralem Pjanic - Juventus to Barcelona (€60million)
10. Leroy Sane - Manchester City to Bayern Munich (€45million)
9. Nathan Ake - Bournemouth to Manchester City (€45.3million)
8. Mauro Icardi - Inter Milan to Paris Saint-Germain (€50million)
7. Ben Chilwell - Leicester City to Chelsea (€50million)
6. Timo Werner - RB Leipzig to Chelsea (€53million)
5. Alvaro Morata - Chelsea to Atletic Madrid (€56million)
3. Victor Osimhen - Lille to Napoli (€70million)
2. Arthur - Barcelona to Juventus (€72million)
1. Kai Havertz - Bayer Leverkusen to Chelsea (€80million)