The Pronamic Pay plugin adds payment methods like iDEAL, Bancontact, credit card and more to your WordPress site for a variety of payment providers.

Noted That:

To install correctly this pronamic-ideal.zip.
Fisrt Download the pronamic-ideal.zip to your computer
Extract/Open pronamic-ideal.zip to Your Computer.
Then, Find readme.txt file inside pronamic-ideal.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "pronamic-ideal.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "pronamic-ideal.zip" Downloaded plugin from your computer, Where you downloaded pronamic-ideal.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Pronamic Pay" folder is added on left sidemenu. Now, Click on "Pronamic Pay" folder.

Noted that: If you do not see "Pronamic Pay" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Pronamic Pay Configurtions and Settings or How to work "Pronamic Pay" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "Pronamic Pay" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Pronamic Pay
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
Requirements The Pronamic Pay plugin extends WordPress extensions with payment methods such as iDEAL, Bancontact, Sofort and credit cards. To offer the payment methods to the vistors of your WordPress website you also require one of these e-commerce or form builder extensions. Automatic installation Automatic installation is the easiest option as WordPress handles the file transfers itself and you don’t need to leave your web browser. To do an automatic install of Pronamic Pay, log in to your WordPress dashboard, navigate to the Plugins menu and click Add New. In the search field type “Pronamic Pay” and click Search Plugins. Once you’ve found the plugin you can view details about it such as the the point release, rating and description. Most importantly of course, you can install it by simply clicking “Install Now”. Manual installation The manual installation method involves downloading the plugin and uploading it to your webserver via your favourite FTP application. The WordPress codex contains instructions on how to do this. Updating Automatic updates should work like a charm; as always though, ensure you backup your site just in case.

Guide

Requirements

The Pronamic Pay plugin extends WordPress extensions with payment methods such as iDEAL, Bancontact, Sofort and credit cards. To offer the payment methods to the vistors of your WordPress website you also require one of these e-commerce or form builder extensions.

Automatic installation

Automatic installation is the easiest option as WordPress handles the file transfers itself and you don’t need to leave your web browser. To do an automatic install of Pronamic Pay, log in to your WordPress dashboard, navigate to the Plugins menu and click Add New.

In the search field type “Pronamic Pay” and click Search Plugins. Once you’ve found the plugin you can view details about it such as the the point release, rating and description. Most importantly of course, you can install it by simply clicking “Install Now”.

Manual installation

The manual installation method involves downloading the plugin and uploading it to your webserver via your favourite FTP application. The WordPress codex contains instructions on how to do this.

Updating

Automatic updates should work like a charm; as always though, ensure you backup your site just in case.

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Reffered: https://wordpress.org/