Going through Master Card API docs to see how to integrate it, saw that they have sample code, checked Java sample code and found this:

String data = MessageFormat.format(
"'{'\"apiOperation\":{0},"
+ "\"sourceOfFunds\":'{'\"type\":{1},\"provided\":'{'\"card\":'{'\"numbe\":{2},"
+ "\"expiry\":'{'\"month\":{3}, \"year\":{4}'}',\"securityCode\":{5}'}}}',"
+ "\"order\":'{'\"reference\":{6}'}',"
+ "\"transaction\":'{'\"amount\":{7},\"currency\":{8},\"reference\":{9},\"targetTransactionId\":{10}'}'," + "\"customer\":'{'\"ipAddress\":{11}'}}'",
apiOperation,
sourceOfFundsType,
cardNumber,
cardExpiryMonth,
cardExpiryYear,
cardSecurityCode,
orderReference,
transactionAmount,
transactionCurrency,
transactionReference,
targetTransactionId,
customerIpAddress );

FOR FUCK SAKE what happened to JSONObject (for Android) class, I'm sure it is a waaaay better solution than that mess ...
And from Oracle:
JsonObject value = Json.createObjectBuilder()
.add("firstName", "John")
.add("lastName", "Smith")
.add("age", 25)
.build();

I guess that is a cleaner understandable solution than what master card has.

Oh my dear internet,

FUCK THIS FUCKING SHIT
I AM SICK AND TIRED OF IT, WHO BUILT THIS HACKED TOGETHER ORWELLIAN SWAMP PIT?

Fuck the same fucking Envato template on every content page with 70 layers of sidebars, inline ads, popups, cookies and content shifting as if I was playing CATCH UP WITH YOUR FUCKING CONTENT.

FUCK the same fucking annual upselling 'plans' on every 7-day trial overengineered scam app that requires me to sign up for 1 fucking, falsely advertised task where my fucking password generator doesn't even recognize the input as a password field so I have to cmd+, to my FUCKING BABYLONIAN PASSWORD ARCHIVES PROMPTING ME FOR THE MASTER PASSWORD.
Thank god I can at least CREATE A BURNER CREDIT CARD THAT FREEZES ITSELF BECAUSE I CANNOT BE BOTHERED TO UNSUBSCRIBE FROM YOUR FUCKING STEAMING CRAP.

FUCK every fucking step I take being recorded by our CYBERPUNK OVERLORDS REQUIRING ME to sign up for 5 different fucking privacy protection tools' annual plan or duct tape some open source shit onto my browser just for some BASIC PRIVACY WHILE TRYING TO NAVIGATE ALL THE OTHER 5000 annuals plan naval mines like A FUCKING FRENCH SUBMARINE IN 1940 GERMAN WATERS.

FUCK my walled garden scam ecosystem not being compatible with your walled garden scam ecosystem prompting me to reactivate my old SATANIC GOOGLE DON'T BE EVIL ACCOUNT from 2012 sending me on a DANTE ALIGHIERI STYLE ODYSSEY THROUGH THE 9 LAYERS OF PASSWORD RESET QUESTIONS, UNEXPECTED ERROR, 2FA MY PHONE DIED HELL to come out on the other side as a broken man.

Thank GOD I have your useless SUPPORT PAGE to aid with my signup problems that is actually just an FAQ with a hidden EASTER EGG HUNT for your support form CRISP AI BOT THAT IS ALSO 'currently experiencing high demand due to COVID' which is peculiar since that has been 3 years ago, but fortunately for you enabled you to fire ALL YOUR SUPPORT STAFF AND REPLACE IT WITH THIS BANNER.

I might as well just SCRAPE your fucking content, it'd be faster.

And although it is quite funny, FUCK THIS PAGE TOO for having me create another of 10.000 accounts to write this shit, where my browser firmly placed a newly created burner email into the PASSWORD FIELD.

I do not know how we managed to create something that is even more unwieldy than 56k DIAL-UPS, but I know that if this shit continues I'll have to train my own AGI to proudly interact with of all this STUPID SHIT on my behalf or I'll have to move into THE FUCKING MOUNTAINS AND LIVE WITH THE DEER.