Add enrollment to existing cart

curl --request POST \
  --url https://api.fluid.app/api/public/v2025-06/commerce/carts/{cart_token}/enrollment \
  --header 'Content-Type: application/json' \
  --data '
{
  "enrollment_pack_id": 812
}
'

import requests

url = "https://api.fluid.app/api/public/v2025-06/commerce/carts/{cart_token}/enrollment"

payload = { "enrollment_pack_id": 812 }
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({enrollment_pack_id: 812})
};

fetch('https://api.fluid.app/api/public/v2025-06/commerce/carts/{cart_token}/enrollment', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.fluid.app/api/public/v2025-06/commerce/carts/{cart_token}/enrollment",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'enrollment_pack_id' => 812
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.fluid.app/api/public/v2025-06/commerce/carts/{cart_token}/enrollment"

	payload := strings.NewReader("{\n  \"enrollment_pack_id\": 812\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.fluid.app/api/public/v2025-06/commerce/carts/{cart_token}/enrollment")
  .header("Content-Type", "application/json")
  .body("{\n  \"enrollment_pack_id\": 812\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.fluid.app/api/public/v2025-06/commerce/carts/{cart_token}/enrollment")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"enrollment_pack_id\": 812\n}"

response = http.request(request)
puts response.read_body

{
  "cart": {
    "id": 48213,
    "cart_token": "ct_7Hk2mQx9vRbT3nWz8LpYc4",
    "state": "start",
    "state_revision": 6,
    "population_status": "complete",
    "email": "holly.flax@dundermifflin.com",
    "phone": "+15705550142",
    "language_iso": "en",
    "currency_code": "USD",
    "currency_symbol": "$",
    "currency_decimal_places": 2,
    "enrollment": true,
    "buyer_rep_id": 5521,
    "customer_id": 30417,
    "enrollment_pack_id": 812,
    "email_marketing": false,
    "sms_marketing": false,
    "auto_apply_points": false,
    "processed": false,
    "valid_for_checkout": false,
    "valid_for_checkout_pre_payment": true,
    "checkout_blockers": [],
    "contains_subscription": false,
    "requires_payment_method": true,
    "digital_only": false,
    "points_enabled": false,
    "cv_total": "109.98",
    "qv_total": "109.98",
    "amount_total": 126.53,
    "amount_total_in_currency": "$126.53",
    "sub_total": 109.98,
    "sub_total_in_currency": "$109.98",
    "tax_total": 6.6,
    "tax_total_in_currency": "$6.60",
    "shipping_total": 9.95,
    "shipping_total_in_currency": "$9.95",
    "discount_total": 0,
    "discount_total_in_currency": "$0.00",
    "subtotal_after_discounts": 109.98,
    "subtotal_after_discounts_in_currency": "$109.98",
    "price_inclusive_of_tax": false,
    "price_inclusive_tax_name": null,
    "totals": {
      "gross_subtotal": "109.98",
      "gross_subtotal_in_currency": "$109.98",
      "net_subtotal": "109.98",
      "net_subtotal_in_currency": "$109.98",
      "item_tax": "0.00",
      "item_tax_in_currency": "$0.00",
      "shipping_net": "9.95",
      "shipping_net_in_currency": "$9.95",
      "shipping_tax": "0.00",
      "shipping_tax_in_currency": "$0.00",
      "total_tax": "6.60",
      "total_tax_in_currency": "$6.60",
      "price_inclusive_of_tax": false,
      "tax_label": null
    },
    "discount_codes": [],
    "buyer_rep": {
      "id": 5521,
      "email": "dwight.schrute@dundermifflin.com",
      "full_name": "Dwight Schrute",
      "image_url": "https://cdn.fluid.app/dunder-mifflin/avatars/dwight-schrute.jpg",
      "external_id": "DM-REP-0042"
    },
    "buyer_rep_member_id": "5f2c9a1e-7b3d-4e8a-a6c2-91d04e7f3b28",
    "available_shipping_methods": [
      {
        "id": 311,
        "title": "Standard Ground",
        "price": 9.95,
        "delivery_time_estimate": "3-5 business days",
        "price_label": null
      },
      {
        "id": 312,
        "title": "Two-Day Express",
        "price": 19.95,
        "delivery_time_estimate": "2 business days",
        "price_label": null
      }
    ],
    "shipping_method": {
      "id": "311",
      "name": "Standard Ground"
    },
    "items": [
      {
        "id": 91547,
        "title": "Dunder Mifflin 20lb Copy Paper",
        "product_title": "Dunder Mifflin 20lb Copy Paper",
        "quantity": 2,
        "price": "54.99",
        "price_in_currency": "$54.99",
        "discount_amount": "0.0",
        "discount_amount_in_currency": "$0.00",
        "tax": "6.60",
        "tax_in_currency": "$6.60",
        "cv": "54.99",
        "qv": "54.99",
        "cv_total": "109.98",
        "qv_total": "109.98",
        "total": "109.98",
        "total_in_currency": "$109.98",
        "line_total_in_currency": "$109.98",
        "regular_line_total_in_currency": "$109.98",
        "enrollment_pack_id": 812,
        "subscription": false,
        "subscription_plan_id": null,
        "display_to_customer": true,
        "image_url": "https://cdn.fluid.app/dunder-mifflin/products/20lb-copy-paper.jpg",
        "free_item": false,
        "allow_subscription": true,
        "enrollment": true,
        "errors": [],
        "variant": {
          "id": 70412,
          "title": "Case of 10 reams",
          "sku": "DM-20LB-CASE",
          "price": "54.99",
          "price_in_currency": "$54.99",
          "currency_code": "USD",
          "options": [
            {
              "title": "Pack size",
              "value": "Case of 10 reams"
            }
          ],
          "physical": true
        }
      }
    ],
    "ship_to": {
      "id": 66120,
      "name": "Holly Flax",
      "address1": "221 Lackawanna Avenue",
      "address2": "Apt 4B",
      "city": "Scranton",
      "state": "PA",
      "subdivision_code": "PA",
      "postal_code": "18503",
      "country_code": "US",
      "phone": "+15705550142",
      "country_num_code": 840,
      "default": true
    },
    "country": {
      "id": 214,
      "name": "United States",
      "iso": "US",
      "iso_name": "UNITED STATES",
      "iso3": "USA",
      "currency_code": "USD",
      "currency_symbol": "$",
      "province_required": true,
      "tax_enabled": true,
      "price_inclusive_of_tax": false,
      "price_inclusive_tax_name": null,
      "tax_standard_rate": null
    },
    "company": {
      "id": 1405,
      "name": "Dunder Mifflin Paper Company",
      "subdomain": "dunder-mifflin",
      "fluid_shop": "dunder-mifflin.fluid.app",
      "primary_domain_hostname": "shop.dundermifflin.com",
      "logo_url": "https://cdn.fluid.app/dunder-mifflin/brand/logo.png",
      "favicon_url": "https://cdn.fluid.app/dunder-mifflin/brand/favicon.png",
      "collect_phone": true,
      "require_phone": false,
      "require_billing_zip": true,
      "order_on_behalf": false,
      "reward_points_enabled": false,
      "collect_sms_marketing": true,
      "collect_email_marketing": true,
      "bundle_subscriptions": false,
      "hide_volume_on_customer_surfaces": true,
      "isolated_payment_tokens": false,
      "kount_environment": "production",
      "kount_client_id": null
    },
    "recurring": []
  },
  "meta": {
    "request_id": "c41e7a90-3b5d-4f28-9e61-8d2a0b7f5c13",
    "timestamp": "2026-09-17T14:22:08Z"
  }
}

{
  "error_message": "<string>",
  "errors": "<string>"
}

{
  "message": "<string>",
  "error": "<string>",
  "error_message": "<string>",
  "errors": "<string>",
  "meta": {
    "request_id": "<string>",
    "timestamp": "2023-11-07T05:31:56Z",
    "shop_url": "<string>",
    "cart": {
      "enrollment": true,
      "id": 123,
      "cart_token": "<string>",
      "state": "<string>",
      "state_revision": 1,
      "population_status": "pending",
      "email": "<string>",
      "phone": "<string>",
      "phone_dialable": true,
      "sms_marketing_preselected": true,
      "language_iso": "<string>",
      "currency_code": "<string>",
      "currency_symbol": "<string>",
      "currency_decimal_places": 123,
      "type": "<string>",
      "buyer_rep_id": 123,
      "customer_id": 123,
      "enrollment_pack_id": 123,
      "enrollment_member_type": {
        "id": "22c58158-7f6c-4f33-a033-32e259941684",
        "slug": "rep",
        "name": "Representative"
      },
      "email_marketing": true,
      "sms_marketing": true,
      "auto_apply_points": true,
      "processed": true,
      "payment_in_progress": true,
      "payment_resume_url": "<string>",
      "valid_for_checkout": true,
      "valid_for_checkout_pre_payment": true,
      "checkout_blockers": [
        {
          "code": "<string>",
          "message": "<string>",
          "field": "<string>",
          "payment": "not_attempted"
        }
      ],
      "contains_subscription": true,
      "vault_without_charge": true,
      "payment_method_auto_assignable": true,
      "requires_payment_method": true,
      "requires_3ds": true,
      "immutable_items": true,
      "digital_only": true,
      "points_enabled": true,
      "messages": {},
      "metadata": {},
      "cv_total": "<string>",
      "qv_total": "<string>",
      "amount_total": 123,
      "amount_total_in_currency": "<string>",
      "sub_total": 123,
      "sub_total_in_currency": "<string>",
      "tax_total": 123,
      "tax_exempt": true,
      "tax_total_in_currency": "<string>",
      "tax_total_for_display": "<string>",
      "inclusive_shipping_tax": 123,
      "shipping_total": 123,
      "shipping_total_in_currency": "<string>",
      "shipping_total_for_display": "<string>",
      "discount_total": 123,
      "discount_total_in_currency": "<string>",
      "subtotal_after_discounts": 123,
      "subtotal_after_discounts_in_currency": "<string>",
      "price_inclusive_of_tax": true,
      "price_inclusive_tax_name": "<string>",
      "totals": {
        "gross_subtotal": "<string>",
        "gross_subtotal_in_currency": "<string>",
        "net_subtotal": "<string>",
        "net_subtotal_in_currency": "<string>",
        "item_tax": "<string>",
        "item_tax_in_currency": "<string>",
        "shipping_net": "<string>",
        "shipping_net_in_currency": "<string>",
        "shipping_tax": "<string>",
        "shipping_tax_in_currency": "<string>",
        "total_tax": "<string>",
        "total_tax_in_currency": "<string>",
        "price_inclusive_of_tax": true,
        "tax_label": "<string>"
      },
      "enrollment_fee": 123,
      "enrollment_fee_in_currency": "<string>",
      "transaction_fee": 123,
      "transaction_fee_in_currency": "<string>",
      "shipping_discount": 123,
      "discount_codes": [
        "<string>"
      ],
      "product_discount_codes": [
        "<string>"
      ],
      "shipping_discount_codes": [
        "<string>"
      ],
      "customer_total_points": 123,
      "customer_total_points_decimal": "120.0000",
      "customer_total_points_in_currency": "<string>",
      "points_applied": 123,
      "points_applied_decimal": "120.0000",
      "points_applied_amount_in_currency": "<string>",
      "remaining_customer_points": 123,
      "remaining_customer_points_decimal": "120.0000",
      "remaining_customer_points_amount_in_currency": "<string>",
      "remaining_cart_amount_after_points": 123,
      "remaining_cart_amount_after_points_in_currency": "<string>",
      "max_applicable_points": 123,
      "points_unavailable_in_market": true,
      "max_applicable_points_decimal": "120.0000",
      "total_creditable_points": 123,
      "total_creditable_points_decimal": "120.0000",
      "shipping_address": {},
      "billing_address": {},
      "discount_breakdown": {
        "internal_discounts": 123,
        "external_discounts": 123,
        "total_discounts": 123
      },
      "external_discount": {},
      "buyer_rep": {
        "id": 123,
        "email": "<string>",
        "full_name": "<string>",
        "image_url": "<string>",
        "external_id": "<string>"
      },
      "buyer_rep_member_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "volume_rep": {
        "id": 123,
        "email": "<string>",
        "full_name": "<string>",
        "image_url": "<string>"
      },
      "volume_rep_member_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "available_shipping_methods": [
        {
          "id": "<string>",
          "title": "<string>",
          "price": 123,
          "delivery_time_estimate": "<string>",
          "price_label": "<string>"
        }
      ],
      "available_payment_methods": [
        {}
      ],
      "payment_unavailable_reason": "no_gateway_for_country",
      "payment_account": {},
      "shipping_method": {
        "id": "<string>",
        "name": "<string>"
      },
      "payment_method": {},
      "items": [
        {
          "id": 123,
          "title": "<string>",
          "quantity": 123,
          "price": "<string>",
          "price_in_currency": "<string>",
          "discount_amount": "<string>",
          "discount_amount_in_currency": "<string>",
          "tax": "<string>",
          "tax_in_currency": "<string>",
          "cv": "<string>",
          "qv": "<string>",
          "cv_total": "<string>",
          "qv_total": "<string>",
          "total": "<string>",
          "total_in_currency": "<string>",
          "line_total_in_currency": "<string>",
          "total_after_discounts": "<string>",
          "total_after_discounts_in_currency": "<string>",
          "line_total_after_discounts_in_currency": "<string>",
          "regular_line_total_in_currency": "<string>",
          "unit_price_display_authoritative": true,
          "price_unavailable": true,
          "subscription_start_notice": {
            "message": "We never bill on the 29th to the 31st, so your first order bills on the 28th.",
            "moved_from": "2026-11-30"
          },
          "enrollment_pack_id": 123,
          "subscription": true,
          "subscription_plan_id": 123,
          "subscription_plans": [
            {}
          ],
          "subscription_only": true,
          "subscription_interval": 123,
          "subscription_interval_unit": "<string>",
          "subscription_interval_unit_identifier": "<string>",
          "subscription_price": "<string>",
          "subscription_price_in_currency": "<string>",
          "subscription_start": "<string>",
          "subscribe_and_save": "<string>",
          "subscribe_and_save_in_currency": "<string>",
          "subscribe_and_save_for_display": "<string>",
          "display_to_customer": true,
          "metadata": {},
          "image_url": "<string>",
          "free_item": true,
          "allow_subscription": true,
          "enrollment": true,
          "errors": [
            "<string>"
          ],
          "creditable_points": 123,
          "product": {},
          "variant": {
            "id": 123,
            "title": "<string>",
            "display_name": "<string>",
            "image_url": "<string>",
            "image_path": "<string>",
            "sku": "<string>",
            "primary_image": "<string>",
            "price": 123,
            "price_in_currency": "<string>",
            "currency_code": "<string>",
            "options": [
              {
                "title": "<string>",
                "value": "<string>"
              }
            ],
            "physical": true,
            "unit_of_size": "<string>",
            "height": 123,
            "width": 123,
            "length": 123,
            "unit_of_weight": "<string>",
            "weight": "<string>",
            "hs_code": "<string>"
          },
          "bundled_items": [
            {}
          ],
          "product_title": "<string>"
        }
      ],
      "ship_to": {
        "id": 123,
        "name": "<string>",
        "address1": "<string>",
        "address2": "<string>",
        "address3": "<string>",
        "city": "<string>",
        "state": "<string>",
        "subdivision_code": "<string>",
        "postal_code": "<string>",
        "country_code": "<string>",
        "phone": "<string>",
        "country_num_code": 123,
        "default": true
      },
      "bill_to": {},
      "attribution": {},
      "agreements": [
        {
          "id": 123,
          "title": "<string>",
          "show_at_checkout": true,
          "default_checked": true,
          "subscription_only": true,
          "standalone_on_checkout": true,
          "show_path": "<string>",
          "enrollment_pack_id": 123,
          "required": true,
          "content_digest": "<string>"
        }
      ],
      "country": {
        "id": 123,
        "name": "<string>",
        "iso": "<string>",
        "iso_name": "<string>",
        "iso3": "<string>",
        "currency_code": "<string>",
        "currency_symbol": "<string>",
        "province_required": true,
        "tax_enabled": true,
        "price_inclusive_of_tax": true,
        "price_inclusive_tax_name": "<string>",
        "tax_standard_rate": 123
      },
      "company": {
        "uuid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "identity_sign_in_enabled": true,
        "checkout_identity_enabled": true,
        "id": 123,
        "name": "<string>",
        "favicon_url": "<string>",
        "primary_domain_hostname": "<string>",
        "subdomain": "<string>",
        "logo_url": "<string>",
        "fluid_shop": "<string>",
        "collect_phone": true,
        "require_phone": true,
        "require_billing_zip": true,
        "checkout_primary_button_color": "<string>",
        "checkout_primary_text_color": "<string>",
        "checkout_secondary_button_color": "<string>",
        "checkout_secondary_text_color": "<string>",
        "order_on_behalf": true,
        "reward_points_enabled": true,
        "reward_points_apply_to_subtotal": true,
        "reward_points_label_singular": "<string>",
        "reward_points_label_plural": "<string>",
        "collect_sms_marketing": true,
        "sms_terms_url": "<string>",
        "sms_privacy_policy_url": "<string>",
        "collect_email_marketing": true,
        "bundle_subscriptions": true,
        "hide_volume_on_customer_surfaces": true,
        "isolated_payment_tokens": true,
        "kount_environment": "sandbox",
        "kount_client_id": "150953359757648"
      },
      "enrollment_pack": {},
      "recurring": [
        {
          "subtotal": 123,
          "subtotal_in_currency": "<string>",
          "interval": 123,
          "interval_unit": "<string>",
          "interval_unit_identifier": "day",
          "subtotal_for_display": "<string>",
          "start_date": "<string>",
          "subscription_start_notice": {
            "message": "We never bill on the 29th to the 31st, so your first order bills on the 28th.",
            "moved_from": "2026-11-30"
          }
        }
      ]
    },
    "code": "<string>",
    "payment_uuid": "<string>",
    "error_details": [
      {
        "code": "<string>",
        "field": "<string>",
        "payment": "not_attempted",
        "message": "<string>"
      }
    ],
    "coded_recovery": true
  }
}

{
  "error_message": "<string>",
  "errors": {
    "enrollment": {
      "code": "enrollment_pack_conflict",
      "existing_enrollment_pack_id": 123,
      "requested_enrollment_pack_id": 123
    }
  }
}

{
  "error_message": "<string>",
  "errors": "<string>",
  "meta": {
    "request_id": "<string>",
    "timestamp": "2023-11-07T05:31:56Z",
    "shop_url": "<string>",
    "cart": {
      "enrollment": true,
      "id": 123,
      "cart_token": "<string>",
      "state": "<string>",
      "state_revision": 1,
      "population_status": "pending",
      "email": "<string>",
      "phone": "<string>",
      "phone_dialable": true,
      "sms_marketing_preselected": true,
      "language_iso": "<string>",
      "currency_code": "<string>",
      "currency_symbol": "<string>",
      "currency_decimal_places": 123,
      "type": "<string>",
      "buyer_rep_id": 123,
      "customer_id": 123,
      "enrollment_pack_id": 123,
      "enrollment_member_type": {
        "id": "22c58158-7f6c-4f33-a033-32e259941684",
        "slug": "rep",
        "name": "Representative"
      },
      "email_marketing": true,
      "sms_marketing": true,
      "auto_apply_points": true,
      "processed": true,
      "payment_in_progress": true,
      "payment_resume_url": "<string>",
      "valid_for_checkout": true,
      "valid_for_checkout_pre_payment": true,
      "checkout_blockers": [
        {
          "code": "<string>",
          "message": "<string>",
          "field": "<string>",
          "payment": "not_attempted"
        }
      ],
      "contains_subscription": true,
      "vault_without_charge": true,
      "payment_method_auto_assignable": true,
      "requires_payment_method": true,
      "requires_3ds": true,
      "immutable_items": true,
      "digital_only": true,
      "points_enabled": true,
      "messages": {},
      "metadata": {},
      "cv_total": "<string>",
      "qv_total": "<string>",
      "amount_total": 123,
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}