curl --request POST \
  --url https://vault.staging.crossmint.com/api/unstable/payment-methods \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --data '
{
  "type": "bank-account-sepa-iban",
  "userLocator": "email:hans.mueller@example.com",
  "bankAccount": {
    "iban": "DE89370400440532013000",
    "bic": "COBADEFFXXX",
    "billing": {
      "name": "Hans Müller"
    },
    "currency": "eur",
    "country": "DE",
    "entityType": "individual"
  }
}
'

{
  "paymentMethodId": "3323460b-d9d2-4ec6-b380-8a3e01e3f226",
  "default": false,
  "displayName": "SEPA Account ••6789",
  "type": "bank-account-sepa-iban",
  "bankAccount": {
    "billing": {
      "name": "Hans Müller",
      "phone": "+4915112345678",
      "address": {
        "line1": "Unter den Linden 1",
        "city": "Berlin",
        "stateOrRegion": "BE",
        "postalCode": "10117",
        "country": "DE"
      }
    },
    "bankName": null,
    "accountSuffix": "6789",
    "currency": "eur",
    "country": "DE",
    "entityType": "individual",
    "bic": "COBADEFFXXX"
  }
}