user: I'm evaluating several mortgage options and need to calculate the monthly payments for different loan scenarios: a $350,000 loan with a 3.5% interest rate over 30 years, a $500,000 loan with a 4% interest rate over 20 years, a $750,000 loan at a 2.5% interest rate with a term of 15 years, and a $1,000,000 loan at a 3% interest rate to be paid off in 10 years. Could you provide me the monthly payment amounts for each of these loans?

Available functions:
name: mortgage_calculator
description: Calculates the monthly mortgage payment.
parameters: type: dict
properties: loan_amount: type: float
description: The amount of the loan.
interest_rate: type: float
description: The interest rate of the loan, ranging from 0 to 1.
loan_period: type: integer
description: The period of the loan, in years.
required: loan_amount
interest_rate
loan_period