Update PayPal Checkout Gateway account via REST API

I use PP checkout,

I tried https://woocommerce.github.io/woocommerce-rest-api-docs/#update-a-payment-gateway with id “ppec_paypal” but with my input. I got 200 response but it doesn’t work.
This is my body request

{"settings": {
    "title": {
      "id": "title",
      "label": "Title",
      "description": "This controls the title which the user sees during checkout.",
      "type": "text",
      "value": "",
      "default": "PayPal",
      "tip": "This controls the title which the user sees during checkout.",
      "placeholder": ""
    },
    
    "api_username": {
      "id": "api_username",
      "label": "Live API Username",
      "description": "Get your API credentials from PayPal.",
      "type": "text",
      "value": "***********",
      "default": "",
      "tip": "Get your API credentials from PayPal.",
      "placeholder": ""
    },
    "api_password": {
      "id": "api_password",
      "label": "Live API Password",
      "description": "Get your API credentials from PayPal.",
      "type": "password",
      "value": "************",
      "default": "",
      "tip": "Get your API credentials from PayPal.",
      "placeholder": ""
    },
    "api_signature": {
      "id": "api_signature",
      "label": "Live API Signature",
      "description": "Get your API credentials from PayPal.",
      "type": "text",
      "value": "****************",
      "default": "",
      "tip": "Get your API credentials from PayPal.",
      "placeholder": "Optional if you provide a certificate below"
    },
    "api_certificate": {
      "id": "api_certificate",
      "label": "Live API Certificate",
      "description": "No API certificate on file.",
      "type": "file",
      "value": "",
      "default": "",
      "tip": "No API certificate on file.",
      "placeholder": ""
    },
    "api_subject": {
      "id": "api_subject",
      "label": "Live API Subject",
      "description": "If you're processing transactions on behalf of someone else's PayPal account, enter their email address or Secure Merchant Account ID (also known as a Payer ID) here. Generally, you must have API permissions in place with the other account in order to process anything other than \"sale\" transactions for them.",
      "type": "text",
      "value": "",
      "default": "",
      "tip": "If you're processing transactions on behalf of someone else's PayPal account, enter their email address or Secure Merchant Account ID (also known as a Payer ID) here. Generally, you must have API permissions in place with the other account in order to process anything other than \"sale\" transactions for them.",
      "placeholder": "Optional"
    }
  }
}

Any help with body request?

Regards
Viet