If you have an existing registered Vodafone SIM, visit your nearest Vodafone Shop with a physical valid photo ID and the required documents to activate M-PAiSA
Please check the full list of requirements here: Customer Identification Requirements.
Or when you purchase a new Vodafone SIM, you can request to activate your number for M-PAISA, provided you present the required documents. The documents and ID you need depend on the wallet Tier you wish to register, that is, either Tier 1 or Tier 2 as listed in Customer Identification Requirements.