18 WhatsApp messages to say 'Thank you':
1. I owe you one.
2. I'm indebted for life!
3. My gratitude knows no bounds.
4. I don't know how to thank you.
5. I am very thankful.
6. I am obliged. Thank you for your consideration.
7. I am extremely grateful for your support.
8. I appreciate your help. Thank you so much!
9. Do you practice being so wonderful? Thank you for your gift.
10. Amazed. Inspired. Grateful. That's how your generosity makes me feel.
11. You’re a lifesaver. Literally. Thank you for believing in me.
12. That is very kind of you. Thank you so much for your help.
13. I am eternally grateful for everything you’ve taught me.
14. I wholeheartedly appreciate everything you’ve done for me.
15. I am overwhelmed by your kind words, thank you for the appreciation.
Informal:
1. Thanks a bunch!
2. Thanks a ton!
3. Thanks!