TacoCode

Nexus Merchants

Customer Portal for Stripe provides shortcodes which allows the currently signed-in user to 
manage their Stripe subscriptions, see their invoices & manage their cards:
<ul>
<li>
<code>[cpfs_list_subscriptions allow-cancel="true"]</code> 
Lists up to 10 Stripe subscriptions. The default value for<code>allow-cancel</code> is <code>false</code>. 
To allow a user to cancel their subscriptions, set <code>allow-cancel="true"</code>.
</li>
<li>
<code>[cpfs_list_invoices]</code> 
Lists up to 10 Stripe invoices.
</li>
<li>
<code>[cpfs_list_cards]</code> 
Lists up to 10 credit cards stored at Stripe.
</li>
<li>
<code>[cpfs_add_card]</code> 
Allows a user to add a new card. The newly added card will be set as default.
</li>
</ul>
<h4>Notes:</h4>
<ul>
<li>
On first visit of any page containing a <code>cpfs_*</code> shortcode, the currently signed-in user will be looked up 
in Stripe using the user’s email address. If not matching customer is found, a customer will be created.
</li>
<li>
If needed, an administrator can manually link a Stripe customer ID to a user by editing the affected user profile 
in WP Admin and updating the <code>Stripe Customer ID</code> field.
</li>
<li>
If an administrator updates the email address of any user in WP Admin, the Stripe customer email will be updated as 
well (or created if the customer doesn’t exist).
</li>
<li>
If a user updates their email address in WordPress, their email will not be updated in Stripe.
</li>
<li>
Responses from Stripe are being cached for 15 minutes to avoid excessive API calls.
</li>
</ul>

Customer Portal for Stripe

Provides shortcodes for Stripe Invoices, Subscriptions & Cards.

Dan Cameron

Sprout Apps

<h4>Speed up the process of getting paid!</h4>
The Ninja Forms + <a href="https://sproutinvoices.com/?utm_medium=link&utm_campaign=free&utm_source=wordpress.org" rel="nofollow ugc">Sprout Invoices</a> plugin allows you to build an easy solution to creating dynamic invoices and estimates based on the prospective client’s form selections. Use Ninja Forms’ product fields or Sprout Invoices’ pre-defined line items to help create an estimate or invoice with the correct totals, and without you having to manage anything after submission.
<h4>Invoice, Estimate / Quote, & Online Payments with Sprout Invoices Features</h4>
If you’re not familiar with <a href="https://sproutinvoices.com/?utm_medium=link&utm_campaign=free&utm_source=wordpress.org" rel="nofollow ugc">Sprout Invoices</a>…it allows you to reduce the time spent fielding project requests, estimating projects, invoicing clients, & getting paid.
<h4>WordPress Invoicing Made Easy</h4>
Our focus since day one 4+ years ago with <a href="https://sproutinvoices.com?utm_medium=link&utm_campaign=free&utm_source=wordpress.org" title="Sprout Invoices Reviews" rel="friend nofollow ugc">Sprout Invoices</a> has been to create a way for WordPress site owners to invoice and EASILY get paid. We also understand that customization beyond branding is important, and that’s why we built the most POWERFUL solution with the most integrations around.
Sprout Invoices allows you to create beautiful estimates and invoices for your clients in minutes — not hours. If you’re not familiar with WordPress templating than our <a href="https://docs.sproutinvoices.com" rel="nofollow ugc">knowledgebase</a> and priority support can help.
Even though our goal is to make getting paid easy, providing fast and reliable support is a priority. We don’t want any user to feel alone.
Trust the <a href="https://wordpress.org/support/plugin/sprout-invoices/reviews/?filter=5" title="Sprout Invoices WordPress.org Reviews" rel="friend ugc">reviews</a> and join an <a href="https://sproutinvoices.com/reviews/?utm_medium=link&utm_campaign=free&utm_source=wordpress.org" title="Sprout Invoices Reviews" rel="friend nofollow ugc">awesome community</a> of happy users.
<blockquote>
Sprout Invoices Pro 
 This plugin is the lite version of the Sprout Invoices Pro plugin that comes with all the invoicing features you will ever need including recurring invoices, recurring payments, pre-defined line items, client dashboards, Stripe and many other payment processors, advanced reporting, hundreds of integrations (including Zapier) and a ton more. <a href="https://sproutinvoices.com?utm_medium=link&utm_campaign=free&utm_source=wordpress.org" title="Sprout Invoices" rel="friend nofollow ugc">Click here to learn more about the best Invoicing plugin for WordPress now!</a>
</blockquote>
<h3>Support</h3>
Priority support is provided with an <a href="https://sproutinvoices.com/?utm_medium=link&utm_campaign=free&utm_source=wordpress.org" rel="nofollow ugc">upgraded version</a>. All free support will provided in the <a href="https://wordpress.org/support/plugin/sprout-invoices" rel="ugc">forums</a>.

Ninja Forms + Sprout Invoices – Easy Invoice & Estimate Submissions

I'm the author/developer so you can't really take my opinion 100% so why not just download the plugin and try for yourself.

One Biased Opinion

Dynamic invoicing (and estimates/quotes) from Ninja Form submissions.

Customer Portal for Stripe vs Ninja Forms + Sprout Invoices – Easy Invoice & Estimate Submissions