When your customers can see and do all in their order from My accounts section, why not returns and exchange?

Return Prime generally installs the button on your theme automatically in most of the case but if you have a custom theme or want to add it manually yourself, just follow the steps below:

Step: 1

Create a snippet in the snippets section and name it returnprime_script.liquid

Once created. Paste the code snippet given below:

<style>
  .js-return-exchange {
    background: #000 !important;
    padding: 6px 10px !important;
    border-radius: 4px !important;
    color: #fff !important;
    text-decoration: none !important;
    white-space: pre;
    position: relative;
    margin: 0 !important;
    min-height: unset !important;
    min-width: unset !important;
  }
  .js-return-exchange.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
    display: inline-block;
    background: none !important;
    color: #000 !important;
    text-align: center;
  }
  
  .js-return-exchange::after {
    content: '';
    display: block;
    width: 1.2em;
    height: 1.2em;
    position: absolute;
    left: calc(50% - 0.75em);
    top: calc(50% - 0.75em);
    border: 0.15em solid transparent;
    border-right-color: white;
    border-radius: 50%;
    animation: rp-btn-rotate 0.7s linear infinite;
    opacity: 0;
  }

  @keyframes rp-btn-rotate{
    from {
      transform: rotate(0);
    }
    to {
      transform: rotate(360deg);
    }
  }

  .js-return-exchange.rp_btn_loading {
    color: transparent !important;
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
  }

  .js-return-exchange.rp_btn_loading::after {
    opacity: 1;
  }


</style>

<script >

    document.addEventListener('DOMContentLoaded', function() {
        let order_numbers = []
        var ReturnElements = document.querySelectorAll('.return__exchange');
        Array.prototype.forEach.call(ReturnElements, function(el, i) {
            order_numbers.push(el.getAttribute('data-order_name'));
        });

        let url = 'https://admin.returnprime.com/get-fulfilled-order-status';
        let data = {
            order_numbers: order_numbers,
            store_name: Shopify.shop
        }

        fetch(url, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify(data),
            })
            .then(response => response.json())
            .then(data => {
                let orders = data.orders;
                Array.prototype.forEach.call(ReturnElements, function(el, i) {
                    let orderId = el.getAttribute('data-order_name');
                    orders.forEach(function(order) {
                        if (order.order_id === orderId && !order.status) {
                            el.querySelector(".js-return-exchange").classList.add("disabled");
                            el.querySelector(".js-return-exchange").innerHTML = "Not avalible";
                        }

                    })
                })

            })
            .catch((error) => {
            });



        // on click of return button redirect to returnprime 

        [...document.querySelectorAll(".js-return-exchange")].forEach(el => el.addEventListener('click', function(e) {
            let OrderId = el.getAttribute('data-order');
            let CustomerEmail = el.getAttribute('data-customer');
            let ReturnUrl = 'https://admin.returnprime.com/fetch_order';

            let data = {
                order_number: OrderId,
                email: CustomerEmail,
                store: Shopify.shop,
               //locale:Shopify.locale //Use it only for multi-lang stores

            }

            el.classList.add("rp_btn_loading");
            fetch(ReturnUrl, {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                    },
                    body: JSON.stringify(data),
                })
                .then(response => response.json())
                .then(response => {
              		el.classList.remove("rp_btn_loading");
                    if (response.success == false) {
                        var ErrorMessage = response.message;
                        alert(ErrorMessage);

                    } else if (response.success == true) {

                       window.location.href = response.url;

                    }
              
              

                })
                .catch((error) => {
                    el.classList.remove("rp_btn_loading");                    
              		var ErrorMessage = error.message;
                    alert(ErrorMessage);
                });
        }))


    });

</script>

Step: 2

1. Go to customers/account.liquid and the below snippet:

 {% include 'returnprime_script' %}

2. Add heading inside the table which has other status of the order (Like fulfilment status, order number etc.)

<th>Return / Exchange</th>

3. Add return/exchange button inside <tbody>

<td data-order_name={{order.id}} data-label="Return" class="return__exchange">
{% if order.fulfillment_status == 'fulfilled' %}
<button class="js-return-exchange {% if order.fulfillment_status != 'fulfilled' %} disabled{% endif %}" data-order="{{ order.name }}" data-customer="{{ customer.email }}">Return / Exchange</button>
{% else %}
  <p class="js-return-exchange disabled"> Not Available </p>
{% endif %}
</td>

Once you are done with the installation, you will be able to see the button in customer order history page:

Tip: You can customise the look and feel of the button to match your branding. The above example shows a button which is designed additionally. With default code, it will be a plain text with a link