This kind of works for calling api. not fully tested.

Demo.c

#include "Ui.h"
#include "Common.h"
#include "Communication.h"
#include "jsmn.h"
#include "LibApi.h"
#include "Print.h"
#include "MessageBox.h"
#include "net_if.h"

// for print
#define FONT16 16
#define FONT24 24
#define PRINT_ONELINE_BUF_LEN 1024
#define PRINT_REVERSE 0x10
#define TYERR_TPH_NO_PAPER (-10)

int PrintDemoReceipt(void)
{
    int iRc = 0;
    unsigned char aucPrintBuf[PRINT_ONELINE_BUF_LEN + 1] = {0};
    const char *dashes = "--------------------------------------------------"; // 50 dashes
    // unsigned short usLen = 0;

    Lib_PrnOpen();

Again:
    Lib_PrnSetSpace(2);

    // add a function to print a logo here, if you have any logo to print

    Lib_PrnSetFont(FONT24, 2, 2);

    // show Merchant Business Name
    iRc = Lib_PrintStr(ALIGN_M | PRINT_REVERSE, (unsigned char *)"MURABELLA", strlen("MURABELLA"));
    if (TY_OK != iRc)
    {
        return iRc;
    }

    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)" ", 1);

    Lib_PrnSetFont(FONT24, 1, 1);

    memset(aucPrintBuf, 0, sizeof(aucPrintBuf));
    sprintf((char *)aucPrintBuf, "%s", "INWARD TRANSFER");
    iRc = Lib_PrintStr(ALIGN_M, aucPrintBuf, strlen((char *)aucPrintBuf));

    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)" ", 1);

    memset(aucPrintBuf, 0, sizeof(aucPrintBuf));
    sprintf((char *)aucPrintBuf, "%s", "Customer\'s Copy");
    iRc = Lib_PrintStr(ALIGN_M, aucPrintBuf, strlen((char *)aucPrintBuf));

    // add some date & time here

    // content start
    // amount
    Lib_PrnSetFont(FONT24, 1, 1);
    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)" ", 1);
    iRc = Lib_PrintStr(ALIGN_L, (unsigned char *)"Amount:", strlen("Amount:"));
    memset(aucPrintBuf, 0, sizeof(aucPrintBuf));
    sprintf((char *)aucPrintBuf, "%s", "₦30,000");
    Lib_PrnSetFont(FONT16, 2, 2);
    iRc = Lib_PrintStr(ALIGN_L, aucPrintBuf, strlen((char *)aucPrintBuf));

    Lib_PrnSetFont(FONT24, 1, 1);
    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)dashes, strlen(dashes));

    // account name
    Lib_PrnSetFont(FONT24, 1, 1);
    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)" ", 1);
    iRc = Lib_PrintStr(ALIGN_L, (unsigned char *)"Account Name:", strlen("Account Name:"));
    memset(aucPrintBuf, 0, sizeof(aucPrintBuf));
    sprintf((char *)aucPrintBuf, "%s", "Ashraf Otagun");
    Lib_PrnSetFont(FONT16, 2, 2);
    iRc = Lib_PrintStr(ALIGN_L, aucPrintBuf, strlen((char *)aucPrintBuf));

    Lib_PrnSetFont(FONT24, 1, 1);
    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)dashes, strlen(dashes));

    // account number
    Lib_PrnSetFont(FONT24, 1, 1);
    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)" ", 1);
    iRc = Lib_PrintStr(ALIGN_L, (unsigned char *)"Account Number:", strlen("Account Number:"));
    memset(aucPrintBuf, 0, sizeof(aucPrintBuf));
    sprintf((char *)aucPrintBuf, "%s", "8892100011");
    Lib_PrnSetFont(FONT16, 2, 2);
    iRc = Lib_PrintStr(ALIGN_L, aucPrintBuf, strlen((char *)aucPrintBuf));

    Lib_PrnSetFont(FONT24, 1, 1);
    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)dashes, strlen(dashes));

    // date
    Lib_PrnSetFont(FONT24, 1, 1);
    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)" ", 1);
    iRc = Lib_PrintStr(ALIGN_L, (unsigned char *)"Date:", strlen("Date:"));
    memset(aucPrintBuf, 0, sizeof(aucPrintBuf));
    sprintf((char *)aucPrintBuf, "%s", "05 - 09 - 2023");
    Lib_PrnSetFont(FONT16, 2, 2);
    iRc = Lib_PrintStr(ALIGN_L, aucPrintBuf, strlen((char *)aucPrintBuf));

    Lib_PrnSetFont(FONT24, 1, 1);
    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)dashes, strlen(dashes));

    // narration
    Lib_PrnSetFont(FONT24, 1, 1);
    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)" ", 1);
    iRc = Lib_PrintStr(ALIGN_L, (unsigned char *)"Narration:", strlen("Narration:"));
    memset(aucPrintBuf, 0, sizeof(aucPrintBuf));
    sprintf((char *)aucPrintBuf, "%s", "NULL");
    Lib_PrnSetFont(FONT16, 2, 2);
    iRc = Lib_PrintStr(ALIGN_L, aucPrintBuf, strlen((char *)aucPrintBuf));

    Lib_PrnSetFont(FONT24, 1, 1);
    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)dashes, strlen(dashes));

    // transaction ref
    Lib_PrnSetFont(FONT24, 1, 1);
    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)" ", 1);
    iRc = Lib_PrintStr(ALIGN_L, (unsigned char *)"Transaction Ref:", strlen("Transaction Ref:"));
    memset(aucPrintBuf, 0, sizeof(aucPrintBuf));
    sprintf((char *)aucPrintBuf, "%s", "ghfjsjshsgdgsjj64784737dsacs6546dc");
    iRc = Lib_PrintStr(ALIGN_L, aucPrintBuf, strlen((char *)aucPrintBuf));
    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)dashes, strlen(dashes));

    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)" ", 1);
    // content end

    Lib_PrnSetFont(FONT24, 2, 2);
    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)" ", 1);

    // add transaction status
    memset(aucPrintBuf, 0, sizeof(aucPrintBuf));
    sprintf((char *)aucPrintBuf, "%s", "**SUCCESSFUL**"); // triple asterisks would overflow
    iRc = Lib_PrintStr(ALIGN_M, aucPrintBuf, strlen((char *)aucPrintBuf));

    // empty line
    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)" ", 1);

    Lib_PrnSetFont(FONT24, 1, 1);

    // add software version
    memset(aucPrintBuf, 0, sizeof(aucPrintBuf));
    sprintf((char *)aucPrintBuf, "%s", "UCARD");
    iRc = Lib_PrintStr(ALIGN_M, aucPrintBuf, strlen((char *)aucPrintBuf));

    Lib_PrnSetFont(FONT16, 1, 1);

    iRc = Lib_PrintStr(ALIGN_M, (unsigned char *)" ", 1);

    memset(aucPrintBuf, 0, sizeof(aucPrintBuf));
    sprintf((char *)aucPrintBuf, "%s %s", "VERSION:", "v 1.5");
    iRc = Lib_PrintStr(ALIGN_M, aucPrintBuf, strlen((char *)aucPrintBuf));
    if (TY_OK != iRc)
    {
        return iRc;
    }

    iRc = Lib_PrnClose();
    if (iRc == TYERR_TPH_NO_PAPER)
    {
        char aucDispBuffer[128] = {0};

        memset(aucDispBuffer, 0x00, sizeof(aucDispBuffer));
        sprintf((char *)aucDispBuffer, "%s\n %s", "Out of paper!", "Add paper[Enter]");
        iRc = MessageBox(aucDispBuffer, MB_COLOR_YELLOW | MB_CENTER | MB_ICONQUESTION, 60000);
        if (iRc == UI_INPUT_ENTER)
        {
            UIClearRect(0, 1, LCD_MAX_SEG, MAX_COM_LINES - 1);
            UITextAlign(ALIGN_M, LCD_OP_Y_S, DISP_MODE_NORMAL, "Printing...");
            Lib_PrnOpen();
            goto Again;
        }
    }

    return TY_OK;
}

// static int jsoneq(const char *json, jsmntok_t *tok, const char *s)
// {
//     if (tok->type == JSMN_STRING && (int)strlen(s) == tok->end - tok->start &&
//         strncmp(json + tok->start, s, tok->end - tok->start) == 0)
//     {
//         return 0;
//     }
//     return -1;
// }

// char *GetTitle()
// {
//     // start
//     // char url[] = "https://jsonplaceholder.typicode.com/posts/1";
//     char url[] = "https://devapi.ucard.store/identity/Agent/login/wallet/initate";
//     unsigned char responseBuffer[4096]; // Adjust buffer size as needed
//     unsigned short responseLength = sizeof(responseBuffer);

//     // Send the GET request
//     if (UIWireHttpSnd(url, NULL, 0, NULL) < 0)
//     {
//         // printf("Failed to send GET request\n");
//         // return -1;
//         TRACE("Ayo: send failed!");
//         return "call failed";
//     }
//     else
//     {
//         TRACE("Ayo: send successful");
//         // Receive the response
//         if (UIWireHttpRecev(responseBuffer, &responseLength) < 0)
//         {
//             // printf("Failed to receive HTTP response\n");
//             // return -1;
//             TRACE("Ayo: recv failed!");
//             return "recv failed";
//         }
//     }
//     TRACE("Ayo: recv successful");
//     // end

//     jsmn_parser parser;
//     jsmntok_t tokens[100]; // Adjust this based on the expected number of tokens in your response
//     jsmn_init(&parser);

//     int tokenCount = jsmn_parse(&parser, (char *)responseBuffer, responseLength, tokens, sizeof(tokens) / sizeof(tokens[0]));

//     if (tokenCount < 0)
//     {
//         // printf("JSON parsing error: %d\n", tokenCount);
//         return NULL;
//     }

//     char *myTitle = NULL;

//     for (int i = 1; i < tokenCount; i++)
//     {
//         if (jsoneq((char *)responseBuffer, &tokens[i], "title") == 0)
//         {
//             int titleLength = tokens[i + 1].end - tokens[i + 1].start;
//             myTitle = (char *)malloc(titleLength + 1);
//             strncpy(myTitle, (char *)responseBuffer + tokens[i + 1].start, titleLength);
//             myTitle[titleLength] = '\0';
//             break;
//         }
//     }

//     return myTitle;
// }

// short TestScreen(int iTimeout)
// {
//     short sRC;

//     Lib_LcdDrowArea(DEFAULT_FORG_COLOR, 0, 30, 320, 210);

//     // char *myTitle = GetTitle();
//     sRC = HttpsGetTest(500);

//     while (1)
//     {
//         // DRAW_TITLE("Test API");
//         // if (myReqHash == NULL)
//         // {
//         //     DRAW_TITLE("No Response!");
//         // }
//         // else
//         // {
//         //     DRAW_TITLE(myReqHash);
//         // }
//         DRAW_TITLE("Test API");
//         DRAW_TEXT("         Enter digit sent to your         Mobile number", 90 + 10);
//         DRAW_TEXT("Press 1 to continue, 0 to cancel", 170 + 10);

//         // if (myTitle)
//         // {
//         //     // DRAW_TITLE(myTitle);
//         //     DRAW_TITLE("call successful");
//         //     // DRAW_TEXT("         Enter digit sent to your         Mobile number");
//         //     DRAW_TEXT("         Enter digit sent to your         Mobile number", 90 + 10);
//         //     DRAW_TEXT("Press 1 to continue, 0 to cancel", 170 + 10);
//         //     // free(myTitle);
//         // }
//         // else
//         // {
//         //     DRAW_TITLE("Title not found");
//         // }

//         sRC = UIWaitKey(iTimeout, 1);
//         if (UI_INPUT_TIMEOUT == sRC || UI_INPUT_CANCEL == sRC)
//         {
//             return sRC;
//         }
//         else
//         {
//             continue;
//         }
//     }
// }

short ApiMustWork(int iTimeout)
{
    int sRC = -1;
    unsigned char ucRecvBuff[3500] = {0};
    unsigned short usRecvBUffLen = sizeof(ucRecvBuff);
    char *myTitle = NULL;

    // Set the network connection mode to SSL mode
    Net_SetSocketMode(NET_MODE_SSL);
    Lib_SetSslSwitch(0);

    // Set the server as: 106.55.177.122:443
    SetServerOpt(SERVER_OPT_POSP_MAIN);
    sRC = UIWireNetTcpLink(NET_MAX_TCPLINK_TIME);
    if (sRC != TY_OK)
    {
        FUN_IN_ERR;
        TRACE("sRC = %d", sRC);
        return TY_ERR;
    }

    // https GET test
    sRC = UIWireHttpSend("https://api.bemfa.com/api/time/now/?type=1", NULL, 0, NULL);

    if (sRC != TY_OK)
    {
        FUN_IN_ERR;
        TRACE("sRC = %d", sRC);
        return TY_ERR;
    }

    // Get Response
    sRC = UIWireHttpRecv(ucRecvBuff, &usRecvBUffLen);
    if (sRC != TY_OK)
    {
        FUN_IN_ERR;
        TRACE("sRC = %d", sRC);
        return TY_ERR;
    }

    // Output response data
    TRACE("usRecvBUffLen = %d", usRecvBUffLen);
    TRACEBUF(ucRecvBuff, usRecvBUffLen);
    Lib_DelayMs(20);

    // Close the network connection
    UIWireNetClose();

    myTitle = "Fine fine fine...";

    Lib_LcdDrowArea(DEFAULT_FORG_COLOR, 0, 30, 320, 210);

    while (1)
    {
        if (myTitle == NULL)
        {
            DRAW_TITLE("GET Api call");
        }
        else
        {
            DRAW_TITLE(myTitle);
        }

        sRC = UIWaitKey(iTimeout, 1);
        if (UI_INPUT_TIMEOUT == sRC || UI_INPUT_CANCEL == sRC)
        {
            return sRC;
        }
        else
        {
            continue;
        }
    }
    return TY_OK;
}