I wanted to use MTN as my payment method

Yes, if MTN is your carrier you can use mobile phone billing as an Apple ID payment method.

See also -> Payment methods you can use with your Apple ID

Payment methods you can use with your Apple ID – Apple Support (UK)

I want to pay Apple Music with my mobile money

Hommies18 wrote:

I want to use MTN mobile money as my payment method, can that be possible if yes please I need the procedure

Whether or not you can depends on your region. See here:

Payment methods you can use with your Apple ID – Apple Support (UK)

I want to use MTN mobile money as my payment method

I want to use MTN mobile money as my payment method, can that be possible if yes please I need the procedure