Hello
I have read the description and would like a chance to work with you, I have worked with POS and API's in the past and also created CRM software. I have been working in this field for over 6 years now, PHP being my Expertise. I have worked as a Full stack developer and as a Server Administrator in both Websites and Mobile Applications (Andriod & IOS).
I would definitely be able to help you out, We can discuss in more detail in the chat.