Всем привет тестирую stripe у меня такая ошибк errors syntaxerror:

Question

Всем привет тестирую stripe у меня такая ошибк errors syntaxerror:

unexpected token '<', "<!doctype "... is not valid json. В чем проблема подскажите ?
Вот мой код json
<script>
function validateForm(data) {
let errors = []

if (data.first_name === '') {
errors.push('First name is empty')
}

if (data.last_name === '') {
errors.push('Last name is empty')
}

if (data.email === '') {
errors.push('Email is empty')
}

if (data.phone === '') {
errors.push('Phone is empty')
}

if (data.address === '') {
errors.push('Address is empty')
}

if (data.zipcode === '') {
errors.push('Zipcode is empty')
}

if (data.place === '') {
errors.push('Place is empty')
}

return errors
}

function buy(event) {
event.preventDefault()

let data = {
'first_name': document.querySelector('input[name=first_name]').value,
'last_name': document.querySelector('input[name=last_name]').value,
'email': document.querySelector('input[name=email]').value,
'phone': document.querySelector('input[name=phone]').value,
'address': document.querySelector('input[name=address]').value,
'zipcode': document.querySelector('input[name=zipcode]').value,
'place': document.querySelector('input[name=place]').value,
}

let errors = validateForm(data)

if (errors.length) {
console.log('Errors', errors)
} else {
var stripe = Stripe('{{ pub_key }}')

fetch('/order/start_order/', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'X-CSRFToken': '{{ csrf_token }}'
},
credentials: 'same-origin',
body: JSON.stringify(data)
})
.then(function(response) {
return response.json()
})
.then(function(session) {
return stripe.redirectToCheckout({ sessionId: session.session.id })
})
.then(function(result) {
if (result.error) {
alert(result.error.message)
}
})
.catch(function(error) {
console.log('Errors', error)
})
}

return false
}
</script>
{% endblock %}