Dear client !!
I reviewed your job posting and understood the need. I feel confident to integrate payment gateway by covering all your requirements. I am available to start work on this project immediately. Just need a quick positive response from your side. I have worked with many API's like Web service APIs, SOAP (Simple Object Access Protocol), REST (Representational state transfer), etc. APIs: Google MAP/Cloud/Image APIs, Amazon S3, Yahoo, Facebook, Twitter, Flickr. I can work easily according to requirement of this job.
Looking forward to hear from you and henceforth building a long-term mutually beneficial relationship.
Regards
Mohd
(Full Stack developer)