x_login: merchant_id
x_trans_key: merchant_password
x_invoice: order_id
x_amount: amount
x_currency: currency_code
x_bank: bank_code
x_country: country
x_description: description
x_iduser: donor_id
x_cpf: fiscal_number
x_name: full_name
x_email: email
# We've been told bdate is non-mandatory, despite the docs
x_bdate: birth_date
x_address: street
x_zip: zip
x_city: city
x_state: state
x_document: gateway_txn_id
country_code: country