curl --request POST \
  --url https://api.decodahealth.com/internal-billing/payment-methods/config \
  --header 'API-KEY: <api-key>' \
  --header 'TENANT: <tenant>'

{
  "sessionKey": "<string>",
  "paymentMethodConfigId": "<string>",
  "paymentMethods": [
    {
      "id": "<string>",
      "patientId": "<string>",
      "rainforestPaymentMethodId": "<string>",
      "brand": "<string>",
      "last4": "<string>",
      "expMonth": 123,
      "expYear": 123,
      "accountHolderType": "<string>",
      "accountNumberLast4": 123,
      "bankName": "<string>",
      "routingNumber": 123,
      "description": "<string>",
      "type": "CARD",
      "isDefault": false,
      "isArchived": false,
      "restrictedToMerchantId": "<string>"
    }
  ],
  "sandbox": true
}