IUGU_ENDPOINTS = {'invoices': 'https://api.iugu.com/v1/invoices', 'customers': 'https://api.iugu.com/v1/customers', 'charges': 'https://api.iugu.com/v1/charges', 'subscriptions': 'https://api.iugu.com/v1/subscriptions', 'plans': 'https://api.iugu.com/v1/plans'}