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Write some Software for payment issue

payment is set up with paypal pro on (plugin)gravity form, which is used to register users and add to database after paying. After successful payment, if user hits back button on browser during session, if it goes back to point when payment is made, it ill charge credit card twice. Not sure how to fix. (thinking simple code of redirect?) or (nocache) open to suggestions.

one freelancer tried but could not do. see 2 attached files for what he wrote. if you bid please read his feedback first to not waste both of our times.. I can increase budget slightly

Consult with about Gravity form (with paypal )experience

Skills: CSS, MySQL, PHP, Software Architecture, WordPress

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About the Employer:
( 6 reviews ) staten island, United States

Project ID: #12308652

24 freelancers are bidding on average $39 for this job

maxsmith8

Hello, Hope you are doing well !! I have gone through your requirements. Lets discuss more over Chat box, So i can define the best suitable time frame to get it finished at the earliest. looking forward to hear More

$30 USD in 1 day
(174 Reviews)
8.0
vtechiti

Dear Employer, I have gone through your requirement and will be glad to work for you. Please take a look of some of the website done by me: ===================================================== [url removed, login to view] More

$98 USD in 4 days
(419 Reviews)
7.5
freeoutsourcer

Read your brief thoroughly and very interested in working on it. I create elegant and appealing experience to satisfy my clients and go the extra miles wherever needed. Portfolio: [url removed, login to view] More

$35 USD in 5 days
(53 Reviews)
6.5
rishabh58

Hi I read through the project details extremely carefully. It is an easy task for us to perform. We have a vast experienced pool of developers who can fix the payment issues you are facing. Looking forward to hea More

$111 USD in 1 day
(48 Reviews)
5.9
phpfreelancer86

Hello Sir, I've reviewed your requirement and I'm ready to work with you. I will provide quality work as well full support for any query. I'm giving you trust for good quality work. I have almost 7+ years of expe More

$45 USD in 1 day
(111 Reviews)
5.8
sadgurusoft

hello sir, we are currently working with WordPress, HTML, PHP and CSS, PSD to HTML, Codeigniter. and we have 3+ year of experience in web Development and web design. we are ready to do this project work based on More

$50 USD in 1 day
(133 Reviews)
5.6
prowebtechnos

Hi there, We can solve this payment issues in your Website. We have worked on the similar task that you are looking for. Kindly provide us the details about the task. Please visit our Portfolio here: https://www. More

$25 USD in 1 day
(86 Reviews)
5.9
nivasoftvietnam

My hourly rate is ONLY $5 per hour = $40 per day (for 8 working hours).“Trial 30% your work before, pay later” is my work principle. We have a production warranty in 12 months if there are errors from what we made Can More

$35 USD in 1 day
(44 Reviews)
5.4
mrphpguru

I have 7 years of vast expertise in WordPress development, I am expert in WordPress/ WooCommerce Development, WordPress Theme customization, WordPress Server Management, WordPress Database management, WordPress SEO an More

$25 USD in 1 day
(64 Reviews)
5.6
aumalaiarasan

Hi Friend, I am having 8 years of experience in LAMPP Technologies. I can start the work immediately. Using Session and Cookie, We can avoid this kind of issue. Do you have Dev/Test Environment?. Thanking you

$25 USD in 1 day
(82 Reviews)
4.9
rimaalliq

I have been in this industry for 2 years and such jobs are my daily practice. This is my first time on this site and hence you can see that I do not have any ratings/testimonials to show you. I can assure you that if y More

$30 USD in 1 day
(31 Reviews)
4.9
$25 USD in 1 day
(30 Reviews)
4.9
arun01012016

Dear Project Owner, Hope I am approaching you in best of your health and spirits!! I can be a suitable match for your work as I am having 8 years of experience in Website designing. I completely fit into the requireme More

$15 USD in 1 day
(37 Reviews)
5.2
shuaibullah

Hello Sira, I have been in this industry for 5 years and such jobs are my daily practice. This is my first time on this site and hence you can see that I do not have any ratings/testimonials to show you. My name is Shu More

$25 USD in 1 day
(12 Reviews)
3.8
fastqualitywork1

Hi Greetings!! Have a look at my some work samples: ---------------- [url removed, login to view] [url removed, login to view] [url removed, login to view] [url removed, login to view] I have seen your project details a More

$30 USD in 0 days
(24 Reviews)
3.9
shanymathew

Dear Sir, i am very good in paypal. i can do it i am very good in PHP,MYSQL,Codeigniter framework,ajax,jquery,css etc. i can provide fast delivery of [url removed, login to view] sure,my work will be worth and pleasure for you. we c More

$20 USD in 1 day
(23 Reviews)
3.9
softwarelabz

hii, we have 5+ year experience in web development. Our strong skills are wordpress,php. further chat we can do if you interested then please contact me. We will sure will complete work on time. Thanks Tea More

$25 USD in 1 day
(18 Reviews)
4.2
pankajsaini1989

Hello, Greetings of the day !! I am well expert PHP ,HTML/CSS developer . I have very good experienced of 5 years . I will fix the issue as per your requirements.I have full time availability for the project and More

$27 USD in 1 day
(4 Reviews)
3.5
$25 USD in 1 day
(10 Reviews)
3.4
trans21

Hello sir, Hope you doing well, i read your project description so pls come technical discussion then we understand n negotiate cost, timeline then we move proceed further , also i show my past work when we discuss More

$20 USD in 2 days
(15 Reviews)
3.7