actions.js

export function makePayment(loanId, amount, paymentMethodId) {
  return dispatch => {
    dispatch(makePaymentSent())
    fetch(`/api/loans/${loanId}/payments`, {
      headers: new Headers({
        'Content-Type': 'application/json',
      }),
      credentials: 'same-origin',
      method: 'POST',
      body: JSON.stringify({
        'amount': amount,
        'paymentMethodId': paymentMethodId,
      })
    })
    .then(response => {
      dispatch(closeModal())
      if (response.status !== 200) {
        dispatch(makePaymentFailed(response.statusText))
      } else {
        return response.json()
        .then(result => {
          dispatch(makePaymentSuccess(result.data))
        })
      }
    })
  }
}