Which of these ingredients are the acid component of a marinade? Here are some ingredients for a a sheek kebab recipe.  Which of these acts as the acid component of the marinade?

onion, lentil flour, green chilli, salt, garlic, ginger, herbs: fenugreek, fresh coriander, spices: cumin seed,coriander podwer, crushed chilli, chilli powder, garam masala(cinnamom, cloves, ginger, star anise, cumin, chilli, fennel, black pepper, bay leaves, sun. oil, nutmeg, cardamom).
I see no acidic elements to your "marinade."  Chili pepper (mentioned in the comments) is probably basic, rather than acidic.  As written (and as commented on) it sounds more like a rub than a marinade.  Both rubs and marinades impart flavor to the surface of proteins. Being acidic is not a requirement of a marinade.