Create a SEPA mandate

curl --request POST \
  --url https://commerce1.on-hellgate.dev/customers/{customer_id}/sepa-mandates \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "bic": "<string>",
  "country_code": "<string>",
  "document": "<string>",
  "iban": "<string>",
  "mandate_name": "<string>",
  "reference": "<string>",
  "sequence_type": "<string>",
  "signed_on": "2023-12-25",
  "address": "<string>",
  "city": "<string>",
  "postal_code": "<string>"
}
'

{
  "address": "<string>",
  "bic": "<string>",
  "city": "<string>",
  "country_code": "<string>",
  "iban": "<string>",
  "mandate_name": "<string>",
  "method": "<string>",
  "postal_code": "<string>",
  "reference": "<string>",
  "sequence_type": "<string>",
  "signed_on": "<string>",
  "status": "<string>",
  "token": "<string>"
}