MAS endpoints

📄️Add new MAS transaction

**Experimental:** Creates a new MAS transaction without starting it. The end-user can select any of the options listed in `masOptions` for completing the transaction.

📄️Start a MAS transaction

**Experimental:** Starts a MAS transaction created by the same company.

📄️Get a MAS transaction

**Experimental:** Retrieves an existing MAS transaction created by the same company.

📄️Get a MAS transaction with all metadata

**Experimental:** Retrieves an existing MAS transaction and all its associated data, if created by the same company.

📄️Get a transaction candidate for the specified MAS option

**Experimental:** Retrieves a what the transaction data would be if for the specified MAS option was selected.

📄️Cancel a transaction

Cancels a transaction created by the same company.